On Sun, Aug 25, 2019 at 04:15 AM, Ian Binnie wrote:
I set up a small group for a club a while ago, and have been sending invitations to remaining members of the club.
One invitation shows Status "Failed - 5.1.2".
What does this mean?
I had a couple of failures (due to typing errors) which were obvious and easily fixed, but this puzzles me. The email address is correct (from my Address Book) - I assume some kind of delivery error, but it is to bigpond.com - Australia's largest telco.
Typically, 5.1.2 means that the email address was incorrect such as being a typo. I found a much more thorough answer by Googling SMTP error 5.1.2:
512 - The host server for?the recipient's?domain name cannot?be found (DNS error)?(also called SMTP Error 5.1.2)?SMTP Error 512 : This SMTP reply code is received?when one of the servers on the way to the destination is?unable to resolve the domain name of a recipient email?address. Said differently : one of the servers on the way?to the destination, including your server or your ISP, has a?DNS problem or, possibly correctly, does not like one of?the email addresses in the message's TO, CC, and BCC?fields.?The first check you should perform to resolve a 5.1.2 reply?code is to check all the recipient email addresses for?incorrect domain names (misspelt domain names, or,?maybe, totally non-existent domain names) - remember,?error code 512 is very specifically an error with the?domain name of one of the recipient email addresses.?You can call the recipient(s) or use the WHOIS tool of The?Ultimate Troubleshooter. If all the recipient email?addresses check out as regards the domain part of the?email addresses, then one of the servers on the way to the?recipient(s) has DNS problems - usually this will be one of?the first 2 servers in the chain, your own mail server (or?your network) or your ISP's mail server.?Examples of typical SMTP error 512 messages : "5.1.2 -?Bad destination host 'DNS Hard Error looking up domain",?or "SMTP Error 550 5.1.2 Host unknown - host cannot be?found", or how about this fantastically informative error?message "5.1.2 The message could not be delivered?because the recipient's destination email system is?unknown or invalid. Please check the address and try?again, or contact your system administrator to verify?connectivity to the email system of the recipient.".?--------------?In summary : most SMTP error 512 conditions are?caused by misspellings of the domain name part of a?recipient email address. However, with the proliferation?of spam, error 512 is also often encountered by automatic?"out-of-office" replies to junk mail because the domain?names used by junk mail are often bogus domain names.??
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Gerald
