Having issues with SMTP on international servers Including GMail

[Datura]

Hey guys,

I have a few clients that can't send or receive mails suddenly on various international servers including GMail, A2Hosting, Zoho.

Are there issues that any of you are aware of? I can't find anything wrong from my end when I do tests from the servers. My Zoho mail is giving me all sorts of errors when trying to send from my client but from webmail it is fine...

Very strange.

Local servers are behaving just fine.

 

[HartsockZA]

I can imagine it has something to do with the war thing lots of hacking and DDoS attacks going on internationally on those servers. But beats me

 

[warwickw]

Check the sending domains DKIM and SPF and overall DMARC status. I believe Google has become very strict on DKIM recently, might be similar with the other receivers.

SPF Check & SPF Lookup - Sender Policy Framework (SPF) - MxToolBox

mxtoolbox.com

DKIM Check- DomainKeys Identified Mail (DKIM) Record Lookup - MxToolBox

mxtoolbox.com

Free DMARC Checker Tool - Check Your DMARC Records

Free DMARC checker tool for fast lookups and validation. Detect DMARC record errors, review policy status, and verify enforcement to secure your email domain.

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