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 include Gmail's Feedback-ID header in DKIM signature
article1 Feedback-ID is an additional header required by Gmail Feedback Loop to see aggregated data in Google Postmaster tools . Gmail requires it to include in DKIM-Signature. The following guide explains how it can be configured in OpenDKIM : Edit opendkim.conf vim /etc/opendkim.conf Add the following line : SignHeaders Feedback-ID Reload openkdim : systemctl reload opendkim.service Reload postfix : systemctl reload postfix.service Send a test email with swaks to gmail : swaks --from postmaster@postfix.io --to xxxx@gmail.com --h-Feedback-ID 123:asd:123 --server 127.0.0.1:25 My test mail results : Authentication-Results: mx.google.com;dkim=pass header.i=@postfix.io header.s=key1 header.b=oY1NVInb;spf=pass (google.com: domain of postmaster@postfix.io designates 45.55.57.182 as permitted sender) smtp.mailfrom=postmaster@postfix.io;dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=postfix.io Date: Sun, 12 Nov 2017 11:04:42 +0000 DKIM-Signature: v=1
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