550 invalid DNS MX or A/AAAA resource record · Issue #510 · nodemailer/nodemailer · GitHub
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550 invalid DNS MX or A/AAAA resource record · Issue #510 · nodemailer/nodemailer · GitHub
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DNS MX record lookup resulting in NOTIMPL treated as non-recoverable · Issue #852 · OpenSMTPD/OpenSMTPD · GitHub
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![surrounded by morons on Twitter: "@successfulsw <support@perfecttableplan.com>: host https://t.co/NzexXV4BOl[212.227.15.41] said: 550-Requested action not taken: mailbox unavailable 550 invalid DNS MX or A/AAAA resource record (in reply to MAIL ...](https://pbs.twimg.com/media/EOY0fICX0AAxfQl.png "surrounded by morons on Twitter: \"@successfulsw <support@perfecttableplan.com>: host https://t.co/NzexXV4BOl[212.227.15.41] said: 550-Requested action not taken: mailbox unavailable 550 invalid DNS MX or A/AAAA resource record (in reply to MAIL ...")
surrounded by morons on Twitter: "@successfulsw <support@perfecttableplan.com>: host https://t.co/NzexXV4BOl[212.227.15.41] said: 550-Requested action not taken: mailbox unavailable 550 invalid DNS MX or A/AAAA resource record (in reply to MAIL ...
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