El 29/01/2015 a las 18:46, Aravindhan escribió:
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? -- View this message in context: http://postfix.1071664.n5.nabble.com/Postfix-SMTP-mail-is-sent-to-SPAM-tp74232.html Sent from the Postfix Users mailing list archive at Nabble.com.
Some free e-mail providers tend to establish a rather agressive policies for e-mails from not well known domains or domains that don't have a good enough reputation. This might probably block a big amount of spam, but on the other side it also sends a lot of legitime mail traffic to junk folders (in the best of cases, in other cases mails are directly rejected via 5XX). Probably this has nothing to do with your configuration, but if you want to be sure you can try to find a service that does all kind of deep checkings for you (for example, try finding 'Unlock the inbox'). If everything is ok, all you can do is tell your mail recipients to whitelist your mail so your domain gains reputation little by little.
Regards, Nicolás
