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I have just recently encoutered a funny prob with customer sending email to my email address domain.
Eg. Sender sends to me at email@example.com from their GMAIL account. Gmail sends them a note saying ...
Technical details of permanent failure:
PERM_FAILURE: SMTP Error (state 9): 554 The IP Address of the sender
(18.104.22.168) was found in a DNS blacklist database and was therefore
Any idea what is wrong as the domain is a gmail domain and not mine and my customer is sending to me and not me sending to them. But when I try with my gmail I get that too but not when I try to send to my other personal email accounts.
I don't do any email marketing but it could be that my email sent out when my customers purchase or signs up.