March 23, 2017

What causes the email domain being rejected by the security appliance or gateway security service at the customer end? How does Mithi’s Cloud based Email Hosted service deal with it?

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There  could be several reasons for this and the exact reason is best given by  the team supporting that security service or appliance. However,  generally the following points can be considered

  • If  only mail from specific senders of your domain is being rejected, most  likely those email ids are blacklisted on the appliance or these email  ids are sending spam due to which the appliance is rejecting these mail.
  • Due  to continuous spamming activity from your domain or IP address, the  reputation of your source (IP and email domain) becomes poor (possibly  on a rating scale), due to which the mail are rejected by the appliance.
  • The  IP address of your outgoing relay server is blacklisted on the spam cop  sites, which reduces its reputation and may cause the appliance to  reject mail.

If you notice, the common thread essentially (root  cause) is that there is a lot of spam generated from the domain users  (internal spam). The way to protect against this happening is to ensure  that email originating from your domain is always as clean as possible.

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