Host to Delete a Specific Email in Postfix on Linux

Author: , September 14th, 2017

root@outbound:/var/log # postqueue -p -Queue ID- –Size– —-Arrival Time—- -Sender/Recipient——- 593E2FC69D 3970 Tue Sep 12 23:15:36 MAILER-DAEMON (connect to[]:25: Connection timed out) — 4 Kbytes in 1 Request. root@outbound:/var/log # postsuper -d 593E2FC69D postsuper: 593E2FC69D: removed postsuper: Deleted: 1 message root@outbound:/var/log # postqueue -p Mail queue is empty

How To Send Email From the Command Line on MacOSX 10.10.5 Yosemite

Author: , January 29th, 2017

I wanted to send email from cron for various reasons, but the emails would bounce with an error 554: 554 5.1.8 : Sender address rejected: Domain not found Clearly, Postfix was using the “internal” hostname of myappledesktop.local (MacOSX has TWO hostnames! also, myappledesktop.local is not the real hostname ;-). So, I needed two things: 1. […]

How To Force Sendmail to Process the Mail Queue

Author: , August 4th, 2016

To force sendmail to process the mail queue, execute as root: sendmail -q -v The optional -v enables verbose mode to assist with troubleshooting. To display the current contents of the mail queue, execute as root: mailq

How To Fix a “Corrupted index cache file” Error in Dovecot

Author: , June 17th, 2016

Jun 17 00:02:45 inbound dovecot: IMAP(yourName): Corrupted index cache file /home/yourName/Maildir/dovecot.index.cache: invalid record size service dovecot stop cd /home/yourName/Maildir/ rm dovecot.index* service dovecot start As always, YMMV. Proceed with caution.

How To Modify the Maximum Allowed Attachment Size in Postfix

Author: , April 22nd, 2015

By default, Postfix restricts attachment size to about 10MB (10240000 bytes). You can check the current value by running the following command: postconf | grep message_size_limit To change the attachment size limit to say 50 MB, run a command like: postconf -e message_size_limit=52428800 You may find that the maximum mailbox size is lower than the […]

How To Use Regular Expressions (regex) To Forward Email In Postfix

Author: , April 7th, 2015

Create the file /etc/postfix/virtual-regexp. For example, forward all emails with a leading eric and ending with to a Gmail account: 1 /eric.*/ /eric.*/ Edit the file /etc/postfix/ Add regexp:/etc/postfix/virtual-regexp to the virtual_alias_maps line. For example: 1 virtual_alias_maps = hash:/etc/postfix/virtual, regexp:/etc/postfix/virtual-regexp virtual_alias_maps = hash:/etc/postfix/virtual, regexp:/etc/postfix/virtual-regexp Generate the map .db file: 1 […]

How To Empty the Email Queue in Postfix

Author: , July 11th, 2013

postsuper -d ALL

How To Delete a Single Deferred Email in Postfix

Author: , January 6th, 2013

To view the Postfix deferred queue: postqueue -p To view a specific email: postcat -q {Queue ID} To delete a specific email: postsuper -d {Queue ID} Example of viewing the deferred queue and deleting a message: # postqueue -p -Queue ID- –Size– —-Arrival Time—- -Sender/Recipient——- E15B9FC221 11627 Sun Jan 6 16:47:29 MAILER-DAEMON (connect to[]: […]

How To Validate Email Addresses in PHP

Author: , October 21st, 2012

1 2 3 4 5 6 $valid = validateEmailAddress(’’);   function validateEmailAddress($email = ”) {    // returns 1 for valid and 0 for invalid    return (int) (filter_var($email, FILTER_VALIDATE_EMAIL) && preg_match(’/@.+\./’, $email)); } $valid = validateEmailAddress(‘’); function validateEmailAddress($email = ”) { // returns 1 for valid and 0 for invalid return (int) (filter_var($email, FILTER_VALIDATE_EMAIL) […]

The Email Charter

Author: , July 8th, 2011

A fantastic website dedicated to reducing the amount of time we spend dealing with email…