There are default mailbox sizes which may lead to mail delivery failure when you go beyond the defaults.  In order to avoid problems you need to understand the difference between mailboxes and virtual_mailboxes as well as know the default sizes and how to adjust them. Here is the error that you want to avoid: mailbox /var/spool/vmaill/vmail/1: error writing message: File too large Mailbox Size Limit Default mailbox size is 50 MB.  This ...

Alternatives Program for MTAs The alternatives program is a way to change the default mail server so that it will be Postfix. This program is only necessary for CentOS not Suse or Ubuntu, as Suse and Ubuntu both use Postfix as the default. Alternatives is a program that will allow you to assess and change the mail program or MTA ...

There are several different components to the email system. They work together to move, deliver or retrieve your email. Mail Transfer Agent (MTA) The MTA does a great deal of the hard work in moving mail around as it is responsible to move the mail from the local MTA to the destination MTA on the Internet. The Mail Transfer Agent ...