How to check Postfix queue size or find the count of messages in queue
mailq | grep -c "^[A-Z0-9]"
You can also grep the last line :
mailq | tail -1
How to configure OpenDKIM with Postfix
article1 In this HowTo, you will find out how we configured OpenDKIM and Postfix(3.1.0) to sign our @postfix.io emails with DKIM. I will not talk about what is DKIM and settings like hash algorithms, DKIM Identity, Selectors etc. Install OpenDKIM and tools. apt-get install opendkim opendkim-tools Add the following settings to /etc/opendkim.conf after “UserID” directive. Map AuthorDomains to RSA keys.KeyTable /etc/dkimkeys/rsakeys.tableSigningTable refile:/etc/dkimkeys/signingdomains.table# "simple" recommended by DKIMCoreCanonicalization simpleMode svSubDomains noAutoRestart yesAutoRestartRate 10/1MBackground yesDNSTimeout 5SignatureAlgorithm rsa-sha256OversignHeaders From Generate RSA key for @postfix.io cd /etc/dkimkeys/opendkim-genkey --bits=1024 --selector=key1 --domain=postfix.io --append-domain It will create two files. “ key1.private ” which is for server side and “ key1.txt ” which contain the following DNS record that needs to be created i
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