AOL Changing Mailer Daemon Error Senders

EQ Admin

EQ Forum Admin
Staff member
AOL is making a change which will affect the behavior of ALL bounce messages for both inbound and outbound mail.

Currently all bounce messages have the sender name of

With the changes for outbound mail, ALL bounce messages will have the sender name of MAILER-DAEMON@sender-domain. For example, an AIM account sending invalid recipients to the internet, will receive a bounce from, and a member from, UK member from

With the changes for inbound mail, ALL bounce messages (mostly due to user-defined spam settings) will have the sender name of MAILER-DAEMON@recipient –domain. For example, a member of yahoo sending to an AIM account with a user-defined block, would receive a bounce message from

This may result in multiple bounce messages generated for a single piece of email being returned to the same sender. One bounce message is generated for each unique recipient domain.

For example, a member of yahoo sending a message with four recipients, two AIM accounts and two accounts (all with user-defined blocks), would receive ONE bounce message from and ONE from

These changes will be installed into production over the next couple of weeks.

Manager, Postmaster Team

Source: AOL Postmaster Blog