At this time, i choose not to setup a full email server on my home setup, but i still need to provide email notifications for some services.

The Gentoo default mail-mta/nullmailer package is more than enough. It should be aready installed, otherwise emerge it:

emerge mail-mta/nullmailer

I assume you already have a mail domain somewhere linked to your @mydomain.com, and you have your own address as myself@mydomain.com and you created a specific mailbox called home@mydomain.com to manage any email sent from services.

All the following files need to be under /etc/nullmailer:

adminaddr

myself@mydomain.com

defaultdomain

mydomain.com

defaulthost

mail

me

mail

remotes

mail.mydomain.com smtp port=587 user=home@mydomain.com pass=**** starttls

Try it from the command line:

(echo "Subject: test email"; echo "Hi! my nullmailer works...") | sendmail -F "Me Myself" -f myself@mydomain.com destination@otherdomain.de