PSCS Wiki

How to filter attachments

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

How to filter attachments VPOP3 can filter attachments in several ways. The most general is to use the Settings -> Attachment Processing -> Filtering tab as described below. VPOP3 can also filter attachments using the content/spam filter, or by using an integrated virus scanner.

Spamfilter Whitelist & Blacklist

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Spamfilter Whitelist & Blacklist The VPOP3 spamfilter has a whitelist and a blacklist for sender addresses. It also has a whitelist and blacklist for words/phrases. You can view these lists in the VPOP3 settings by going to Settings -> Spamfilter ->

Handling mail for multiple incoming domains

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Handling mail for multiple incoming domains VPOP3 can easily handle mail for several incoming domains. Exactly how you do it depends on the exact situation. All domains are 'aliases' If the domains are aliases of each other, for instance, you have 'mycompany.com' and 'mycompany.org', both of which are the same, so each address at mycompany.com also exists at mycompany.org, and the emails go to the same people regardless of which domain is used, then you simply configure the domains in the ma…

VPOP3 Not Starting Properly

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

VPOP3 Not Starting Properly If VPOP3 is not starting properly, then the first thing to check is whether the database server is starting. In VPOP3 v3 and later, VPOP3 uses a PostgreSQL Database server for data storage, so if the database server is not running, VPOP3 will not be able to start properly. In this case, the VPOP3.EXE process may appear in Task Manager, but it won't respond to anything, or it may appear in Task Manager and then stop after a short period.

Data stream contained NUL character

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Data stream contained NUL character Description of the problem NUL characters (bytes with value 0) are not allowed in email messages and should not be transmitted over POP3, SMTP or IMAP4 except in certain circumstances. If an attachment contains such a byte it must be encoded using

How to tell VPOP3 that some users in the local domain are not to be handled by VPOP3

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

How to tell VPOP3 that some users in the local domain are not to be handled by VPOP3 In some situations you will have a situation where most of your users are handled by VPOP3, but several users will collect their mail directly from a separate POP3 account on your ISP, even though they may have an email address on the same domain as other users.

Mail Not Downloading From ISP

Anonymous (anonymous@undisclosed.example.com) — 2026-04-06T17:59:47+00:00

Mail Not Downloading From ISP This normally happens because you have told VPOP3 to Leave Messages On Server (on the Mail Connectors -> Mail Collectors -> (name) -> POP3 General tab). If you do this, VPOP3 will leave messages on the ISP's mail server for several days, and remember that it has already downloaded them. Then, the next time it connects it will see that there are some messages waiting, but it may find that it has already downloaded them, so it won't download them again.

VPOP3 - POP3 Client Problem

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

VPOP3 - POP3 Client Problem These errors occur whilst VPOP3 is communicating with your ISP's POP3 mail server to retrieve your mail. The server connection was closed unexpectedly If the message text is Error with Pop3 Client (XXXX (YY)) The server connection was closed unexpectedly

Sending mail from different email addresses or domains

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Sending mail from different email addresses or domains VPOP3 does not (by default) place any restrictions on which email addresses or domains you can send mail from. However, there may be external restrictions on which email addresses/domains you can send from. For instance, if you send mail through your ISP's mail server, they may only allow you to send mail from specific addresses, or the domain you send mail from may have a sender policy defined, such as

421 4.3.2 VPOP3 Too many connections from your IP address - try later

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

421 4.3.2 VPOP3 Too many connections from your IP address - try later If you see this error message when you are sending messages, then it means that VPOP3 has detected too many simultaneous connections from your IP address. This would usually happen if the sender is another mail server as they can make many simultaneous connections when there are lots of messages to send. The error code that VPOP3 gives means that the sender should try sending the messages later, so it should be possible to e…

550/553 Not Permitted error from BT Internet's mail servers

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

550/553 Not Permitted error from BT Internet's mail servers BT Internet's mail servers only allow messages to be sent from 'approved' email addresses. If you try to send messages from other addresses BT's mail servers may return a '550 Not Permitted' error, a '553' error, or may silently discard the message depending on what their server feels like doing today.

Socket Error 10061 - The attempt to connect was forcefully rejected

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Socket Error 10061 - The attempt to connect was forcefully rejected Error 10061 means that the computer which VPOP3 was trying to connect to (probably at your ISP) refused the connection from the computer running VPOP3. There are several possibilities that can cause error 10061:

How to Backup VPOP3

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

How to Backup VPOP3 By default VPOP3 v3 and later will automatically perform a daily backup of the database into a file called DBBACK-x.DMP, where the backup file rotates on a weekly basis (DBBACK-0.DMP is Sunday's backup, DBBACK-1.DMP is Monday's backup, etc).

Configure Email Signatures

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Configure Email Signatures * Global Signatures * Personal Signatures * Webmail Signatures Notes When creating a signature it is generally best to keep it as short as possible. Disclaimers & confidentiality notices in emails are generally regarded as having little or no legal significance, so lengthy signatures just use up bandwidth.

Copy Outgoing mail

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Copy Outgoing mail Sometimes people need to copy outgoing mail for various reasons. There are several ways of doing this in VPOP3 depending on your exact requirements: * Message Monitoring - this copies all outgoing, incoming and/or internal mail sent by/to specific users to another specific user

Error expanding recipient - Nesting Level too deep

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Error expanding recipient - Nesting Level too deep You receive an error message saying: Error expanding recipient "" Nesting Level too deep (51) Check the configuration for loops (Note the '51' number may be slightly different - that's the nesting level - anything over 50 is detected as an error)

Exchange 2007

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Exchange 2007 You can link VPOP3 to Exchange Server, so that Exchange Server sends outgoing mail through VPOP3 and VPOP3 sends any incoming mail directly to Exchange Server. You should first of all set up VPOP3 to send and receive Internet email as normal.

Full Text Search

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Full Text Search In VPOP3 Enterprise v7.0 a facility for full-text-search on message content was added. Because the full-text-search indexes can be quite big, this facility is optional. For several reasons, the full-text-search is stored in a separate PostgreSQL database. This means that it is not backed up with your standard backups. After a restore, the full-text-search index can be rebuilt from the raw message content.

Incoming SMTP Feed

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Incoming SMTP Feed An incoming SMTP feed is where incoming mail is sent directly to your mail server without going through your ISP's POP3 mail server on the way. Advantages An incoming SMTP feed has several advantages over going via a POP3 mailbox:

We installed a new router and now nothing works

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

We installed a new router and now nothing works If you installed a new router on your network and left it at the default settings, you may find that VPOP3 doesn't seem to work afterwards. This is because it may be that the new router allocates new IP addresses on your network.

Many instances of Postgres.exe are running

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Many instances of Postgres.exe are running If you are running VPOP3 3.0 or later, and look in the 'Processes' list in Windows TaskManager you will probably see multiple instances of postgres.exe running. This is perfectly normal, and does not indicate a problem. The PostgreSQL database works by having a separate instance of postgres.exe for each connection to the database (as well as a few extra for management and house keeping). This behaviour is documented on the

How to configure Mozilla Thunderbird

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

How to configure Mozilla Thunderbird This article won't show you all the possible settings in Thunderbird, because there are so many. Thunderbird is one of the most powerful & flexible email clients available at the time of writing, especially if you use IMAP4 (with VPOP3 Enterprise).

Outlook / Outlook Express is sending mail repeatedly

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Outlook / Outlook Express is sending mail repeatedly If you are using Outlook or Outlook Express you may occasionally find that mail is being sent repeatedly. There are a couple of possible reasons for this which we know of Sending taking too long

Performance Requirements

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Performance Requirements The performance requirements for VPOP3 depends on many factors, so we can't give specific details for any scenario. How to detect limiting factors * Use the Windows Performance Monitor (perfmon.msc) * Add counters for:

Sender Policy Framework / SPF

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Sender Policy Framework / SPF SPF is a system used to tell mail servers which IP addresses can send mail from which domains. It is designed to reduce 'spoofing' of email addresses. For instance, if you receive an email message from your bank, your mail software can check that it came from an IP address authorised to send mail from your bank, and treat the message with suspicion if it didn't come from an authorised IP address.

Signing outgoing mail with DKIM

Anonymous (anonymous@undisclosed.example.com) — 2020-07-22T10:32:40+00:00

Signing outgoing mail with DKIM DKIM, also known as DomainKeys Identified Mail, is a form of email authentication that digitally signs emails to prove that they were sent from authorized domains and aren't fake emails. Companies like Google and Yahoo use DKIM to sign their emails and it is becoming ever more popular.

Spam filter not working

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Spam filter not working If the VPOP3 spam filter appears not to be working at all, the first thing to do is to look at the message headers of an incoming message to see if the spam filter is being run at all. Check to see if a header line beginning with X-VPOP3-Spam

Timeout while VPOP3DB is starting

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Timeout while VPOP3DB is starting (Note that VPOP3 v6.11 and later, the service startup system has changed so it should not suffer from this problem) When VPOP3DB starts up, the service control manager component waits a set time for a response from the database server before it knows the service has started. If the PC is going slow (eg after a Windows update or if the PC is just slow) then this wait may not be long enough.

Troubleshooting Tips

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Troubleshooting Tips Telnet One of the most basic, and useful, tools for troubleshooting email systems is a Telnet client. Installing Telnet Client Unfortunately, since Windows XP, Microsoft do not install the Telnet client into Windows by default, so you may need to install the Telnet client yourself.

Error message: VPOP3 Alert - Non-existent user -

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Error message: VPOP3 Alert - Non-existent user - If you receive an error message like: Subject: VPOP3 Alert - Non-existent user - Delivery Failure Report. There was incoming mail for non-existent user "". This means that VPOP3 downloaded a message using POP3 and it was addressed to an email address which does not exist.

VPOP3 Deleting messages as 'old' messages

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

VPOP3 Deleting messages as 'old' messages If VPOP3 says 'deleting old message' in the status window activity log that means that it has seen the unique ID of that message before, longer ago than the time specified for VPOP3 to leave messages on the server, so it thinks that the message is an old message, and so deletes it.

SMTP Relay Protection in VPOP3

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

SMTP Relay Protection in VPOP3 SMTP Relay Protection should be used on ALL SMTP mail servers (such as VPOP3) which have a permanent connection to the Internet. You may also want to use it on servers which are only connected occasionally via a dial-up connection.

VPOP3 Status Monitor Problems

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

VPOP3 Status Monitor Problems The VPOP3 Status Monitor is the program which shows the little (usually red) postbox icon in the Windows task tray. This usually launches automatically from the Windows startup group. This program is VPOP3Status.EXE on the disk, or can be run manually from

Error message: Your connection has been blocked temporarily - Try again later

Anonymous (anonymous@undisclosed.example.com) — 2018-11-14T10:45:49+00:00

Error message: Your connection has been blocked temporarily - Try again later If you get an error message in your email client software saying Your connection has been blocked temporarily - Try again later or Server access temporarily blocked! Please try again later