Unable To Relay Mail Through Gmail Anymore

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Hi,

I have my CentOS7 sendmail configured to relay outgoing system e-mail through my gmail account.

The setup recently stopped working. Gmail SMTP keeps returning “service unavailable”.

I think it has something to do with the recent changes in Gmail authentication procedures.

Does anyone know how to make the relaying work again? I could not find anything on the Net.

Thanks Frank

4 thoughts on - Unable To Relay Mail Through Gmail Anymore

  • I’m assuming you are pushing the mail to gmail through port 465 or
    587. If that’s the case, if you aren’t already, you will need to set up and use a google “app password”. Alternatively, get whatever you are using on the CentOS side that authenticates with gmail to support OAuth 2.

    You can no longer use your google side-wide password to authenticate
    3rd party apps with gmail so need to use one of the alternatives in its place.

    I would actually expect you to get an authentication failure message so they may have changed something else that disabled this approach.

  • I can send mail from my C7 box (via sendmail) to myself at my gmail account using gmail’s SMTP server. I don’t very often forward mail THRU
    gmail to other sites, so I don’t know if that has changed.