On 1/29/2015 12:46 PM, Aravindhan wrote: > 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) > smtp.mailfrom=t...@maildomain.com; dkim=pass header.d=maildomain.com; > x-hmca=pass > header.id=t...@maildomain.com > 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 "check-a...@verifier.port25.com" 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?
Sounds as if you're doing every thing right. Make sure your IP has correct FCrDNS. Looks as if your SPF and DKIM are working. Does anyone still use DomainKeys? Not sure that adds any value. Some of the freemail providers will spam-tag perfect mail from new domains and/or new IP addresses, especially if a "large" amount of mail shows up from that new domain or IP. For some undefined value of large. See if you can sign up for the bulk mail feedback loop or whatever bulk sender programs they might have at hotmail or yahoo. Only the receiving system can answer why some specific mail was marked as spam, all we can do is guess. -- Noel Jones
