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Hello;
I’ve been searching and reading through numerous posts, but can’t seem to find a resolution to my email issue.
I’m seeing the following in my logs, every few minutes;
Apr 10 23:53:50 toronto01 postfix/smtpd[2497]: warning: hostname toronto01.kasnetwork.com does not resolve to address 159.203.56.205
Apr 10 23:53:50 toronto01 postfix/smtpd[2497]: connect from unknown[159.203.56.205]
Apr 10 23:53:50 toronto01 postfix/smtpd[2497]: disconnect from unknown[159.203.56.205]
I have reverse pointers setup and the hostname does resolve at mxtoolbox --> https://mxtoolbox.com/SuperTool.aspx?action=ptr%3A159.203.56.205&run=toolpage
I just can’t seem to figure out why this error occurs as the logs offer no real explanation. No rejected messages, or SASL login failed, etc., such as this entry;
Apr 10 23:59:42 toronto01 postfix/smtpd[2666]: warning: hostname 80-69-247-10.pasargadnet.ir does not resolve to address 80.69.247.10
Apr 10 23:59:42 toronto01 postfix/smtpd[2666]: connect from unknown[80.69.247.10]
Apr 10 23:59:45 toronto01 postfix/smtpd[2666]: warning: unknown[80.69.247.10]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Apr 10 23:59:45 toronto01 postfix/smtpd[2666]: disconnect from unknown[80.69.247.10]
I don’t know where this “connection” is coming from. It appears as if the server is connecting to itself, but for what reason and why it doesn’t resolve I just can’t understand.
Any pointers would be greatly appreciated!
Thanks; Kyle
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Maria Smith
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bitandmap
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David Sen