I have a strange one here.
There’s a domain that is sending email to us, but it cannot be received. I checked the logs, and I see no record of any attempts with that address.
I looked into it, and it’s a subdomain that has no a record. They do have a DMARC setup for it and it’s from an otherwise large institution.
I whitelisted it initially before I had looked into it, but it had no effect. Later I looked into the logs to see what was happening and found it wasn’t in the logs at all. Then I looked for the DNS info.
Would having no A record be automatically blocked so that it doesn’t even register in the logs? Seems strange, but I feel it’s either overzealous core spam blocking in exim or something on their end where they don’t attempt to send to a particular domain for whatever reason. Very odd for there to be no record in the logs, because I see discarded messages all the time in the logs if they are flagged.
It’s happening to two domains, both hosted on our server for the same customer.
If they send to another provider’s generic email account they come through no problem.
There’s nothing blacklisted, but even then that shouldn’t affect incoming. DNS records seem to be fine and haven’t changed in decades.
I personally have received email 8 months ago from the same address at one of my domains, but haven’t been able to test recently since this problem started occurring.
Any idea what might be going on here?
There’s a domain that is sending email to us, but it cannot be received. I checked the logs, and I see no record of any attempts with that address.
I looked into it, and it’s a subdomain that has no a record. They do have a DMARC setup for it and it’s from an otherwise large institution.
I whitelisted it initially before I had looked into it, but it had no effect. Later I looked into the logs to see what was happening and found it wasn’t in the logs at all. Then I looked for the DNS info.
Would having no A record be automatically blocked so that it doesn’t even register in the logs? Seems strange, but I feel it’s either overzealous core spam blocking in exim or something on their end where they don’t attempt to send to a particular domain for whatever reason. Very odd for there to be no record in the logs, because I see discarded messages all the time in the logs if they are flagged.
It’s happening to two domains, both hosted on our server for the same customer.
If they send to another provider’s generic email account they come through no problem.
There’s nothing blacklisted, but even then that shouldn’t affect incoming. DNS records seem to be fine and haven’t changed in decades.
I personally have received email 8 months ago from the same address at one of my domains, but haven’t been able to test recently since this problem started occurring.
Any idea what might be going on here?