Nagios email notification doesn't work for me

Question

I have Nagios 3 installed. To send email notifications I installed msmtp and configured it this way:

defaults
auth             on
tls              on

# A first gmail address
account        default
host           smtp.gmail.com
port           587
from           my_account@gmail.com
user           my_account@gmail.com
password       my_password
tls_trust_file /usr/share/ca-certificates/mozilla/Equifax_Secure_CA.crt

I put .msmtprc to the /var/lib/nagios forder (it's nagios' home folder) and then chowned it to nagios and chmoded it to 0600.

I checked /usr/bin/mail works great. However I cannot receive notifications from nagios.

[1311248385] EXTERNAL COMMAND: SEND_CUSTOM_SVC_NOTIFICATION;allinone;Account administration service;0;nagiosadmin;test failure 2
[1311248385] SERVICE NOTIFICATION: roman;allinone;Account administration service;CUSTOM (CRITICAL);notify-service-by-email;Connection refused;nagiosadmin;test failure 2
[1311248385] SERVICE NOTIFICATION: pavel;allinone;Account administration service;CUSTOM (CRITICAL);notify-service-by-email;Connection refused;nagiosadmin;test failure 2