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FastMail Forum All posts relating to FastMail.FM should go here: suggestions, comments, requests for help, complaints, technical issues etc. |
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21 Mar 2018, 08:41 PM | #1 |
Member
Join Date: Sep 2014
Posts: 55
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got this message when trying to send to a certain address
Apparently some antispam program doesn't like how fastmail sends email? I don't know much about it so I thought I'd ask here. I got this message when trying to send.
The mail system <address@imtryingtosendto.com>: host filter10.antispamcloud.com[188.138.56.27] said: 550 Sender (mydomainname.com) has no A, AAAA, or MX DNS records. (in reply to RCPT TO command) why does this happen? its the only time i've ran into it. |
22 Mar 2018, 01:08 AM | #2 |
The "e" in e-mail
Join Date: May 2003
Location: mostly in Thailand
Posts: 3,084
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If you are using FastMail to host the DNS for the 'imtryingtosendto.com" domasin, and are using the default settings, you should raise a support ticket.
If the DNS for the domain is being hosted elsewhere, it is almost certain that the issue is caused by misconfiguration of the settings around the mail exchange servers. If possible, get the DNS provider to assist you in correcting those settings., |
22 Mar 2018, 03:27 AM | #3 | |
Member
Join Date: Sep 2014
Posts: 55
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Quote:
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22 Mar 2018, 03:46 AM | #4 |
The "e" in e-mail
Join Date: May 2003
Location: mostly in Thailand
Posts: 3,084
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If "mydomainname.com" is a FastMail owned domain, or your own domain with the DNS hosted by FastMail, raise a support ticket. I have always found FastMail's configuration of their DNS for email purposes to follow best practices, but perhaps there could have been an accident somewhere along the line. The message you received seems to suggest the destination server is verifying the existence of MX records and AAAA (which are IPv6 only) records for "mydomain.com". I think the AAAA records are optional, but the MX records certainly ought to be there.
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22 Mar 2018, 07:30 AM | #5 |
Master of the @
Join Date: Feb 2017
Location: USA
Posts: 1,683
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Maybe I am wrong, but I don't see how he could be using the domain to receive his email without A or MX records. Even if you are just sending email from that domain (no receiving) I would imagine it would kill deliverability to not have the DNS set up normally.
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