Good afternoon. There are 2 rooms, Internet from 1 provider, but 2 different router and 2 dynamic ip (all devices in room 2 and connected to the router 2 errors are identical).
In 1 room, all is stable, in the second mail access (send message or even log into the user account) periodically absent, the Internet works flawlessly. The cause of the outage was not clear, he sometimes resumes. For example, in PT care - did not work in the PN - come- all-day, in W open until 9 am and is disabled until the router was not reconnected (helped 20 min), a software reboot of the router does not help. Client - Thunderbird, when not working, tried to download other clients didn't help. Through the web-mail interface does not go. Router settings dropped, the provider says that they do that create this problem are unable to do. Tried the client to change ports, protection methods (SSL/TLS) - nothing helps. The mail server is pinging, even when running mail, so it's not him, the people responsible for the server say that the problem we do not know what MB problem.
On this router 18 PCs + phones, MFP. On the phone is the client, switch to wi-fi with 1 rooms or 4g - works.
Error, by the way: "Error sending the message. The MB message is not sent, since the timeout of the connection to the outgoing mail Server (SMTP) "domain-mail" has expired. Try again"
The logs, at 11:35 was not working at 11:40 works like nothing normal
Solution to see only 1 - to change the router, but no spare and not the fact that will help, and buy just that
upd1: the provider said that with this problem you need to contact the mail server and tell them that we have 2 gray IP behind a NAT. 2 is a view of the grey room 1 and room 2.
upd2: hooked other router, while watching his work