Effective 11 July 2013, our outgoing SMTP servers will stop relaying outgoing messages which use well-known domains like gmail.com,yahoo.com, aol.com etc in the sender address. Messages sent using such domains in the sender address will be silently discarded.
This is being done as most of these domains use SPF and DKIM, hence relaying mails for them decreases our SMTP server’s reputation and increases chances of legitimate mails getting misidentified as spam.
If you have any questions or concerns regarding this change, please open a support ticket via our control panel to let us know.
[Jun 29] We have extended the deadline by which we will be implementing this to 11th July 2013.