Mail.err FAILED: run_command: can't fork

Hello,

I’m running Yunohost 2.2 on a Raspberry wheezy
moulinette: 2.2.1.1
moulinette-yunohost: 2.2.6
yunohost-admin: 2.2.1
I’m having some error log in /var/log/mail.err
How can that impact yunohost?
Could you help me, please?

thank you

Oct 18 09:15:56 raspberrypi amavis[3604]: (03604-16) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 4751.
Oct 18 09:15:58 raspberrypi amavis[3605]: (03605-16) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 8242.
Oct 18 09:17:10 raspberrypi amavis[3605]: (03605-17) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 8639.
Oct 18 09:17:40 raspberrypi amavis[3604]: (03604-17) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 5477.
Oct 18 09:19:10 raspberrypi dovecot: master: Error: service(imap-login): Initial status notification not received in 30 seconds, killing the process
Oct 18 09:19:11 raspberrypi dovecot: imap-login: Fatal: master: service(imap-login): child 10357 killed with signal 9
Oct 18 09:19:29 raspberrypi amavis[3605]: (03605-18) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 9576.
Oct 18 09:22:32 raspberrypi amavis[3604]: (03604-18) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 6446.
Oct 18 09:22:33 raspberrypi amavis[3605]: (03605-19) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 9868.
Oct 18 09:23:26 raspberrypi amavis[3605]: (03605-20) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 10478.
Oct 18 09:58:01 raspberrypi amavis[10438]: (10438-03) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 4051.
Oct 18 10:04:27 raspberrypi amavis[10438]: (10438-04) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 5693.
Oct 18 10:05:04 raspberrypi amavis[10579]: (10579-03) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 4799.
Oct 18 10:18:57 raspberrypi amavis[10438]: (10438-05) (!!)file(1) utility (/usr/bin/file) FAILED: run_command: can’t fork: Ne peut allouer de la m\303\203\302\251moire at /usr/sbin/amavisd-new line 3586, line 5947.