## SMTP Standard Services

The usual services without further notes:

* Mail Exchange (MX)
* SMTP Submission (AUTH Relay)


## Email Access
Both POP and IMAP protocol are supported, both only via TLS-secured connections.


## Mailing Lists

Netwichtig has been providing mailing lists for a while in the past but had to stop due to software issues.  Mailing Lists are back now, with pgp-support, through Schleuder.  Non-encrypted lists are also planned again, either using Sympa or Mailman.

Current keyid is <%= link_to('51276A643395F3F79126F21D9A4AEC868CDF2EB7', 'https://keys.openpgp.org/search?q=51276A643395F3F79126F21D9A4AEC868CDF2EB7') %>.


## Spam Filtering

Mainly done in the MTA, as exim is very powerful in that regard, through a combination of (ca. 20, as of 2018) carefully selected DNS lists (e.g. <%= link_to('Spamhaus', 'https://www.spamhaus.org/') %>, content scanners, relatively strict adherence to protocol specifications, tarpitting, etc.