Kategoriearchive: Mail


How to send emails properly

To send emails with Postfix, a few things have to be considered. These are either defined in RFCs or generally useful. 1. matching reverse DNS RFC1912 requires that the PTR record and the A record in DNS match. On the one hand it shows that the administrator understands the RFCs, […]


DKIM-Patch – public key: OpenSSL error: bad base64 decode 7

The used dns-server must a TXT-record with a length > 255 chars if you use a key-strength > 1024 bit. Otherwise amavis reports during the key-checks public key: OpenSSL error: bad base64 decode. If you run your own dns (bind) with ISPConfig just adjust the database dbispconfig on your dns-server, […]


DKIM-Patch 1.1.7 4

A new version of the DKIM-Patch for ISPConfig is available now. Download: DKIM-Patch Changes to 1.1.6: german translation for DMARC fixed error during resync add latest dmarc-drafts increase size for txt-records to allow the admin to change txt-records for dkim


Create DMARC-Reports 1

After the DMARC Records checks in DMARC check on Debian Wheezy, I show how reports can be created and sent. First, we need a mysql database and a user to save the DMARC checks. Invoke mysql and run: CREATE DATABASE opendmarc; CREATE USER ‘opendmarc’@’127.0.0.1’ IDENTFIED BY ‘top_secret’; GRANT ALL PRIVILEGES […]


DKIM-Patch 1.1.6 4

A new version of the DKIM-Patch for ISPConfig is available now. Download: DKIM-Patch Changes to 1.1.5: allow the admin to change txt-records for dkim, dmarc and spf directly fixed fr-language for the resync-tool fixed regex for spf-includes


DMARC check on Debian Wheezy 16

I have already described in DMARC Record (Domain-based Message Authentication, Reporting & Conformance), how to set up a DMARC record and why this makes sense. Now we need to pay attention to such DMARC record in the delivery of mail. The verification of a DMARC Records requires valid SPF and […]


DKIM-Patch 1.1.5 24

A new version of the DKIM-Patch for ISPConfig is available now. Download: DKIM-Patch Changes to 1.1.4: create dkim-path during install DMARC requieres SPF and DKIM (this breaks the current draft but DMARC is useless if you use spf OR dkim) fixed an error if the dkim-path does not exists add […]