Context:
- Debian (Linux version 3.16.0-4-amd64 (debian-kernel@lists.debian.org) (gcc version 4.8.4 (Debian 4.8.4-1) ) #1 SMP Debian 3.16.43-2+deb8u3 (2017-08-15)
- Vmware Esxiv 6 , 3vCPU, 16Go RAM
- Postfix + Mailman

When I want to install SpamAssassin (apt-get intsall), both spamassassin and sa-compile are downloaded.
But when trying to be installed, sa-compile says he is depending on Spamassassin ant that the package is not configured. But I can't configure SA without sa-compile functional.
Manually executed, sa-compile returns a DNS error:

unresolvable name: DNS at /usr/share/perl5/Mail/SpamAssassin/DnsResolver.pm line 128.

I have no other issue about this DNS configuration.

At the end of sa-compile execution, it says that spamassassin is compiled.

When I check the service status, I have:

● spamassassin.service - Perl-based spam filter using text analysis
   Loaded: loaded (/lib/systemd/system/spamassassin.service; disabled)
   Active: failed (Result: timeout) since lun. 2017-09-18 15:41:22 CEST; 12min ago

sept. 18 15:39:52 srvmailtst spamd[9739]: logger: removing stderr method
sept. 18 15:41:22 srvmailtst systemd[1]: spamassassin.service start operation timed out. Terminating.
sept. 18 15:41:22 srvmailtst spamd[9743]: spamd: server killed by SIGTERM, shutting down
sept. 18 15:41:22 srvmailtst spamd[9743]: spamd: cannot unlink /var/run/spamassassin.pid: No such file or directory
sept. 18 15:41:22 srvmailtst systemd[1]: Failed to start Perl-based spam filter using text analysis.
sept. 18 15:41:22 srvmailtst systemd[1]: Unit spamassassin.service entered failed state.

Would any of you have an idea to help me with this issue? I've searched for and tried a lot of experiments but I've been on this for weeks and my users get impatient.

Thank you all.

Cat.