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how_to:sender_domain_must_resolve [2018/11/14 10:45] (current) |
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+ | ======Sender Domain Must Resolve====== | ||
+ | If you receive an 'SMTP Client Error' something like: | ||
+ | ''451 (user@domain.com) Sender Domain Must Resolve'' | ||
+ | |||
+ | this means that the ISP's mail server cannot find the domain.com part of the email address. | ||
+ | |||
+ | Often this means that the FROM address of the message is invalid, or that the ''Settings -> Local Mail -> Default Domain'' is incorrect. This setting should always be a valid Internet email domain. | ||
+ | |||
+ | Occasionally this can happen if you have just registered a new domain (or moved the domain to a new ISP) as the DNS entries for the domain can take a while to propagate to all DNS servers, so the mail server may be talking to a DNS server which doesn't recognise the name yet - in this case waiting a few hours may cause the problem to rectify itself automatically. | ||
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+ | If you know that the FROM addresses you are using are correct, try contacting the ISP to get them to check their settings - it is not unknown for their servers to be set up incorrectly. | ||
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+ | {{tag>SMTP client error_code domain resolve send}} |