Bulk email sending issue with Ubuntu 14.04 (Linode VPS)

I have an email server on Linode.com with the following specs:

  • Ubuntu 14.04
  • Apache & MySQL
  • Postfix, Dovecot, Spamassassin, Postgrey, RoundCube, sievemail components.

Problem: Everything works fine but when I try to send bulk email to more than 15 recipients, it gives the error “Too many recipients”. I am using Microsoft Outlook 2010 to send and receive emails and I see this error in MS Outlook.

My questions:

  1. What could be the possible issue and how to solve it?
  2. Is there any limit set in Postfix which is not allowing to send bulk email? How to uplift that limit?
Asked By: Arslan Ramay

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Postfix does indeed have a limit on the number of recipients in a single message, which is specified by the smtpd_recipient_limit configuration directive. Its default value is 1000, but it can (of course) be modified in Postfix’s configuration files. To obtain its current value, run

postconf | grep smtpd_recipient_limit

In this case the limit was set to 16, and so Postfix rejected messages with more than 16 recipients.

Answered By: fkraiem