I have installed postfix mail server in ubuntu machine. I configured the mail
server as well as DNS properly.
Mails are sent from our mail server properly, but all the mails are listed
in the spam folder(in Yahoo & Outlook). It is listing properly in the inbox
in Gmail.
I have implemented the following methodologies to prevent the SPAM, which is
as follows,
* SPF
* DKIM
* Domain Keys
After the above implementation, Headers of the email is as follows,
Authentication-Results: hotmail.com; spf=pass (sender IP is
xx.xx.xx.xx)
[email protected]; dkim=pass header.d=maildomain.com;
x-hmca=pass
[email protected]
DomainKey-Signature: a=rsa-sha1; s=mail; d=maildomain.com; c=simple;
q=dns;
b=key
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=maildomain.com;s=mail;
t=1422532895;bh=W+pft8+RS+1CGEuNXIA20Br1EeZE1qaANUx3o6nvb3E=;h=From:
To:Subject:From;b=key
I have checked the several email testing service to detect why our emails
are marked as spam and the result is as follows,
* Sent the mail to the "[email protected]" and got
the authentication report mail.
==========================================================
Summary of Results
==========================================================
SPF check: pass
DomainKeys check: pass
DKIM check: pass
Sender-ID check: pass
SpamAssassin check: ham
* Tested the email with "https://www.mail-tester.com/"; and got the score
"9.3/10".
* Checked our mail server IP address in
"http://whatismyipaddress.com/blacklist-check"; and our IP address is
not blacklisted.
Note:
* Mailserver hosted in Amazon EC2 instance with a static IP address (connect
to internet, and all traffic ports are opened for inbound and outbound in
security groups).
* Mail sending service limit has been increased properly(Support query has
been raised to amazon and the mail restriction has been removed in our
account).
* I am using self signed certificate in my Mail server.
Can any one let us know, how to prevent the email sent as spam. Is there
anything, we need to look into our mail server configuration?
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