Am 26.10.2018 um 14:44 schrieb Sorin Srbu: > Here is a typical guide I've used for CentOS 6, and that I've used for the > problem server above as well as for other CentOS 7-machines. > <https://www.jeffgeerling.com/blogs/jeff-geerling/configure-sendmail-centos> That "guide" is not really useful nor clever. In a scenario like yours, you would setup Sendmail as a nullclient. That's documented in cf/README. Or even drop Sendmail and choose a software like msmtp or ssmtp which is dedicated for such purpose. You don't need the MTA functionality of Sendmail. > Is setting up sendmail different on CentOS 7 in any way, as compared to > CentOS 6?? Not really. > Anything else I should double-check? Your logs will tell you what is happening and where to look at closer. If you like to get specific help from this list I feel you should provide your sendmail.mc and log content demonstrating your issue(s). Alexander