Mailserver with dynamic IP

[minjaverde]

i know after solving problems you will always find a good tutorial :-)
Important is to read the right documentation :-) or searching with the right words.

maybe a hint should be made to this How To. This How To explains how to solve this Problem but doesn't match this specified Problem to the Soultion (maybe this exists already and i was to blind to find that too :-)). The doing was the smaller Part.

anyway i know i am not perfect ;-)