Failure to deliver emails to the outside (gmail, external domain, etc)

Hello Team,
Yesterday at 7:30 pm I have an Exchange server I am in charge of that could no longer send emails to the outside and therefore no longer receive any. The internal emails were working. around midnight, the external emails started working again. i don't understand what happened. Which logs can i look at to understand this malfunction? Every avenue of investigation and understanding is welcome.
Version : Exchange server 2010 SP3
Windows Server 2008R2 SP1
dema skorlovyExchange AdministratorAsked:
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FOXActive Directory/Exchange EngineerCommented:
Are you going through a smarthost?  If so, get in contact with them to verify if they are online.
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timgreen7077Exchange EngineerCommented:
If everything is working now, just review the event logs to see if anything happened to the actual exchange servers. If you don't see anything, it is possible the issue wasn't your exchange servers but something else, like the smarhost, or ISP or anything that plays a part in outbound traffic. When looking at the event logs review the application logs.
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dema skorlovyExchange AdministratorAuthor Commented:
Hi FOX,
I asked the smarthost manager but nothing to report on this side
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dema skorlovyExchange AdministratorAuthor Commented:
Hi timgreen7077,
all right. I'll check the event logs on the mail server. Thank you I'll let you know if I find anything.... or not ;-)
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dema skorlovyExchange AdministratorAuthor Commented:
I looked at the application event logs but unfortunately I did not find anything as anomalies concerning the transport of emails. I will consider that it was an external problem to my Exchange servers.
Thank you for your help.
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timgreen7077Exchange EngineerCommented:
Agreed, the issue may have been external to Exchange. Can't do much about that.
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dema skorlovyExchange AdministratorAuthor Commented:
Yes I understand but thank you for your answers and your availability
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timgreen7077Exchange EngineerCommented:
Provide answer to user. closing question.
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