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In general, never have an MX configured in your authoritative DNS zonefile without proper SPF and DKIM. Deliverability to outbound SMTP destinations will be ver
by walrus01 5y ago
In general, never have an MX configured in your authoritative DNS zonefile without proper SPF and DKIM. Deliverability to outbound SMTP destinations will be very poor.
Not fastmail specific.
- technion 5y agoA side issue here is that if you don't have an MX record configured (say, you figured a domain isn't used for mail), it doesn't mean "we don't accept mail". You'll be surprised at how much spam ends up being directed at your apex A record, because according to the RFC that's where it goes in the absence of an MX record. Use MX 0 . For such domains.