Hello, We upgrade our postfix with ssl/auth connection.postfix-2.3.3-2.3.el5_6 centos 5 32bits to postfix-2.6.6-2.2.el6_1.x86_64 centos 6 64bits Some user said that they must click 2 times on send email for their email to be sended. (first time say : could not contact server) .. but it work for 90% of user (it worked perfectly on old centos 5 postfix)
Most are on windows XP with thunderbird, in our IT network we could not reproduce problem... with a native XP or VirtualBox XP. Sylpheed work with no problem on the windows XP where thunderbird fail :( , and it's not work too at user home and work office for those user.
I'am lost .. Thanks for your help
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