Exim Sender Verification Failing

[purdofolte]

Hello

I can receive emails from Hotmail and Outlook users, but not able to get email from Microsoft itself!

2024-12-21 16:59:16 H=mail-mw2nam10on2125.outbound.protection.outlook.com (NAM10-MW2-obe.outbound.protection.outlook.com) [40.107.94.125] sender verify defer for <[email protected]>: host lookup did not complete
2024-12-21 16:59:16 H=mail-mw2nam10on2125.outbound.protection.outlook.com (NAM10-MW2-obe.outbound.protection.outlook.com) [40.107.94.125] X=TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_128_GCM:128 CV=no SNI="mail.mydomain.com" F=<[email protected]> temporarily rejected RCPT <[email protected]>: Could not complete sender verify

[sahsanu]

Hi @purdofolte

Take a look to this similar post:

Issues getting emails from Microsoft

Hi @luisedofon The message is clear, the domain messaging.microsoft.com has an MX record defined: $ dig messaging.microsoft.com mx +noall +ans messaging.microsoft.com. 2636 IN MX 10 messaging-microsoft-com.mail.protection.outlook.com. But host messaging-microsoft-com.mail.protection.outlook.com doesn’t resolve to an IP. $ dig messaging-microsoft-com.mail.protection.outlook.com a +noall +ans $ dig messaging-microsoft-com.mail.protection.outlook.com aaaa +noall +ans And obviously…

[purdofolte]

Straight forward. Thank you @sahsanu

Do you have any idea what causes this issue? It was working fine a few years ago till yesterday

[sahsanu]

@purdofolte

Do you have any idea what causes this issue?

Yes, seems a dns issue resolving the sender’s domain:

host lookup did not complete