Assuming everything structural is working correctly as you indicated below, the problem might be with your domain name. .cc is perhaps the most abused TLD there is, so much so that google doesn't even return search results if they're .cc domains. Many anti-spam systems will reject a mail outright if it contains a .cc domain, as the false positive to malicious ratio makes it an easy choice.
--adam From: mailop [mailto:[email protected]] On Behalf Of Andreas Blaha Sent: Friday, January 27, 2017 4:18 AM To: [email protected] Subject: [mailop] problems sending to gmail Dear all, Firstly, hello to all, I am new to this list and not too experienced in explaining technicalities as well. I face the following problem: I am running a mail server using postfix and dovecot, set up multidomain, sending IPv4 and IPv6 (whatever shouts first, seems to be chosen randomly), and all seems to work fine. I have set up SPF, DKIM and DMARC, all tests state that nothing is wrong but emails sent to gmail.com users are landing in their spam folder. I checked RBL listings - nothing, I have set up a TXT record in my DNS for google-site-verification, still the same. Does anyone have an idea what else could cause this behaviour? The main domain is fortytwo.cc. Any advise would be highly appreciated! If more information is required please let me know. Many thanks in advance Andy
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