Your mail server certificate is invalid error

Anonymous
2018-03-03T15:59:06+00:00

I am attempting to use Outlook on my android phone.  When I attempt to add my email account to outlook (on my phone) I get an error that says:  Your mail certificate is invalid.  Would you like to login anyway.   PLEASE HELP!!!!

Outlook | Outlook for mobile | Outlook for Android | For business

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

0 comments

102 answers

Sort by: Newest
Most helpful Newest Oldest
  1. Anonymous
    2018-04-26T12:39:04+00:00

    We are using a Comodo certificate and have and have not run any updates on our 2007 exchange server in about 5 years.  Anyone else in that same situation?  I'm wondering if it could be related to root certificates?

    We have another 2007 mail server on a different domain that uses a GoDaddy certificate and no issues that I am aware of.

    Was this answer helpful?

    0 comments
  2. Anonymous
    2018-04-26T12:13:51+00:00

    +1 here. We're also seeing this issue on Android devices within the past 24 hours.

    We have hundreds of users complaining that they cannot receive e-mail. If MS haven't issued a fix within the next few hours then we'll have no option but to start migrating users to the gmail app instead. We just cannot have users disconnected for what is already a prolonged period of time. Once our users are onto gmail, we won't be moving people back due to the amount of work it causes our department and the disruption it causes our end users.

    Was this answer helpful?

    4 people found this answer helpful.
    0 comments
  3. Anonymous
    2018-04-26T11:30:06+00:00

    If it's spreading with a lots of users affected, I hope that we can expect a resolution from Microsoft, in despite that Exchange 2007 is obsolete.

    Was this answer helpful?

    0 comments
  4. Anonymous
    2018-04-26T11:21:01+00:00

    This seems to be spreading...

    Looks like Outlook client tries verifying the SSL intermediate authority with some Microsoft servers, rather than doing this locally or on Exchange server. All Android and iPhone Outlook clients are currently broken on our Exchange 2010 server.

    Was this answer helpful?

    2 people found this answer helpful.
    0 comments
  5. Anonymous
    2018-04-26T08:29:51+00:00

    Same problem here.

    All android devices since yesterday keeps showing certificate error popup without any system change and with a valid certificate.

    I also added my own CA to CA store in the android device without any luck.

    With Exchange 2007 too.

    No workarround yet.

    Thanks.

    Was this answer helpful?

    1 person found this answer helpful.
    0 comments