Mail server sending email as spam

Hi members,

I have install ispconfig mail server, I can receive and send mails,

I tried to send mail to gmail for testing purpose. But my gmail inbox has no incomming mail, instead mail is sent to gmail spam folder.

Any one with idea on this issue, please help .

Regards
John Mwasenga

 

Did you set the rDNS matching the A-Record?
The HELO-String matchs the rDNS record?
SPF, DKIM and DMARC may be usefull, too.
http://blog.schaal-24.de/mail/emails-richtig-versenden/?lang=en
http://blog.schaal-24.de/ispconfig/dkim-patch-1-0/?lang=en

 

Thanks very ,much florian,

PTR record was not configured, i have fixed the problem.