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erics, March 18th, 2022 |
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vi /etc/postfix/master.cf bounce unix - - n - 0 discard defer unix - - n - 0 discard |
Categories: How-To's, Technology Bounce, defer, Disable, Discard, Email, howto, master.cf, PostFix, tips
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erics, March 17th, 2022 When I sent email from my desktop Mac cron jobs, it went out with the full hostname as the domain, i.e.: root@demo.wyzaerd.com, when all I wanted was a simple root@wyzaerd.com for ease of deliverability and domain maint. Edit the mail configuration file main.cf:
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vi /etc/postfix/main.cf |
Add/edit the myorigin value of $mydomain:
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myorigin = $mydomain |
Categories: How-To's, Technology Change, Domain, Email, Hostname, MacOS, mail, main.cf, Masquerade, mydomain, myorigin, PostFix
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erics, December 7th, 2021 I needed to block email based on the Subject header. The solution is simple: Edit main.cf as root and uncomment or add:
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header_checks = regexp:/etc/postfix/header_checks |
Next, creaate or edit /etc/postfix/header_checks as root and add the following line:
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/subject:\sbad subject text here/ REJECT header_checks NO SPAM ALLOWED /subject:\stest subject text here/ DISCARD header_checks NO SPAM ALLOWED |
Finally, run sudo postfix reload NOTE: Do NOT add the “i” after the regular expression! It is case-insensitive by […]
Categories: How-To's, Technology Block, Check, Checks, Discard, Header, header_checks, headers, howto, PostFix, Reject, Spam, Subject, tips
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erics, August 12th, 2021 vi /etc/postfix/main.cf
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#inet_protocols = all inet_protocols = ipv4 |
service postfix restart
Categories: How-To's, Technology Email, Error, Gmail, howto, IPv4, IPv6, PostFix, Protocol, tips
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erics, 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 yourDomain.com[10.10.10.10]:25: Connection timed out) yourUser@yourDomain.com — 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
Categories: How-To's, Technology Delete, Email, howto, PostFix, postqueue, postsuper, Queue, tips
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erics, 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. […]
Categories: How-To's, Technology 10.10.5, Bounce, cli, Command line, Email, FQDN, howto, macosx, mail, main.cf, PostFix, Send, tips, Yosemite
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erics, September 13th, 2016 Step 1. Execute the following two commands: postconf -e smtpd_sender_restrictions=pcre:/etc/postfix/rejected_domains postconf -e reject_unauth_destinations=pcre:/etc/postfix/rejected_domains If that doesn’t work, you may hand-edit main.cf and add/edit these lines:
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smtpd_sender_restrictions=pcre:/etc/postfix/rejected_domains reject_unauth_destinations=pcre:/etc/postfix/rejected_domains |
Step 2. Create the regex filter file: vim /etc/postfix/rejected_domains
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/\.top$/ REJECT No spam allowed from the .top TLD /\.stream$/ REJECT No spam allowed from the .stream TLD |
Step 3. Signal Postfix to reread the config: postfix reload NOTE: Do NOT use the postmap command for the […]
Categories: How-To's, Technology Amazon Linux, AWS, Block, Filter, howto, Linux, PostFix, tips, TLD
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erics, 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
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service dovecot stop cd /home/yourName/Maildir/ rm dovecot.index* service dovecot start |
As always, YMMV. Proceed with caution.
Categories: How-To's, Technology AWS, Cache, Cache file, Corrupted, Corrupted index, Dovecot, Email, File, howto, IMAP, Index, Linux, mail, Mailhost, PostFix, tips
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erics, 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 […]
Categories: How-To's, Technology Attachment, Email, Email attachment, howto, Limit, mailbox_size_limit, Max, message_size_limit, postconf, PostFix, tips
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erics, April 7th, 2015 Create the file /etc/postfix/virtual-regexp. For example, forward all emails with a leading eric and ending with @thewyz.net to a Gmail account:
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/eric.*/@thewyz.net wyzaerd@gmail.com |
Edit the file /etc/postfix/main.cf. Add regexp:/etc/postfix/virtual-regexp to the virtual_alias_maps line. For example:
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virtual_alias_maps = hash:/etc/postfix/virtual, regexp:/etc/postfix/virtual-regexp |
Generate the map .db file:
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postmap /etc/postfix/virtual-regexp |
This example requires the files virtual and virtual.db to exist, even if they are […]
Categories: How-To's, Technology Email, Expression, Forward, howto, main.cf, PostFix, Regex, Regular, Regular Expression, Regular Expressions, tips, Virtual, virtual_alias_maps, virtual.db
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