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--- how_to:550_not_permitted [2012/05/22 15:54] – paul
+++ how_to:550_not_permitted [2018/11/14 10:45] (current) – external edit 127.0.0.1
@@ Line 7: / Line 7: @@
 Or, it may happen because you are using an email address which BT don't recognise. In this case, see [[problems_sending_mail_via_bt_from_your_own_domain|this article]]
-If none of these help, you may need to use a different SMTP relay service. There are several around, such as [[http://www.authsmtp.com]], or we can provide an SMTP relay service starting from £40 a year (contact [[support@pscs.co.uk]] for more information).
+We have no confirmed information that this helps, but it may be worth turning off [[wp>Bounce_Address_Tag_Validation|BATV]] support in VPOP3 (version 5 or later). BATV changes the local part of the sender's email address so that legitimate bounce messages can be verified. This is a very useful feature for preventing spam "back-scatter", and does not cause problems with sensible mail server configurations, however it may cause a problem in this case. To turn it off, go to Settings -> Misc Settings -> BATV, and uncheck the 'Enable BATV Support' box. Note that BATV has to be a global setting because of the way it works, so if you send mail through several different mail servers, you cannot disable it just for one.
+If none of these help, you may need to contact BT technical support to find out exactly what their error message means in your particular instance. Alternatively you could use a different SMTP relay service. There are several around, such as [[http://www.authsmtp.com]], or we can provide an SMTP relay service for VPOP3 users starting from £40 a year (contact [[support@pscs.co.uk]] for more information).
+The above information has been useful in the past, but is not guaranteed to help, since BT may change their server configurations at any time. Since we have no access to BT's mail server configuration, we cannot know what rules their server is applying at a particular time.
 Note that as an alternative to mail forwarding, a better way may be to allow remote access directly into the VPOP3 mailbox. See
   - [[Allow remote access to VPOP3 mailboxes]], or
   - [[Using a mobile phone with VPOP3]]
+=====Diagnosis=====
+If you think VPOP3 should be sending mail from a particular email address, and want to confirm this, you should go to Settings -> Diagnostics -> Session Logs, and turn on 'Log SMTP Client Connections'.
+Now, VPOP3 will record its conversation with the ISP SMTP server to a log file called ''SMTPCLT.LOG'', usually in the VPOP3\_LOGS or the VPOP3 installation directory. You can open that log file in a text editor, such as Notepad. If you look for a line containing 'MAIL FROM: ' that will contain the sender's email address which VPOP3 is sending to BT's mail server, which will let you confirm that it is using the correct address.

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