This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

SMTP suddenly stopped working

more options

Hello,

So - SMTP suddenly stopped working in our whole company. We are using Gmail accounts configured with Thunderbird for a few years already. It's all been working until an hour ago.

Tried deleting and adding accounts, changing authentification to google app passwords etc.\

SMTP servers do have different descriptions.

Just configured an account in outlook and it works out of the box, so I'm guessing it's got something to do with Thunderbird settings, but we didn't change anything, and especially that we have 8 PCs and it stopped working on every one of it.

The error I get when trying to send a message is:

"Sending message failed. The message failed to send because it failed to connect to the outgoing mail (SMTP) server "smtp.gmail.com". The server may be unreachable or not accepting SMTP connections. Please verify that your outgoing mail server settings are correct and then try again or contact your server administrator."

(translated from polish).

Best regards.

Hello, So - SMTP suddenly stopped working in our whole company. We are using Gmail accounts configured with Thunderbird for a few years already. It's all been working until an hour ago. Tried deleting and adding accounts, changing authentification to google app passwords etc.\ SMTP servers do have different descriptions. Just configured an account in outlook and it works out of the box, so I'm guessing it's got something to do with Thunderbird settings, but we didn't change anything, and especially that we have 8 PCs and it stopped working on every one of it. The error I get when trying to send a message is: "Sending message failed. The message failed to send because it failed to connect to the outgoing mail (SMTP) server "smtp.gmail.com". The server may be unreachable or not accepting SMTP connections. Please verify that your outgoing mail server settings are correct and then try again or contact your server administrator." (translated from polish). Best regards.

All Replies (5)

more options

Hello there We have read the question We try to help you.

Your SMTP configuration is failing you with this entire department, okay .

have you checked your SMTP configuration and Imap settings or are they filled in correctly? Can you send me a screenshot of both of them?you have 8 pcs running? What kind of PCs are these? Windows PCs? Your most recent Thunderbirds version was this what it s happened with?

And in what time do you have the program for the Last Updated, can I ask?


Greetings Firefox volunteer

Modified by Googlethunderbird

more options

Hello there


https://support.mozilla.org/en-US/kb/how-to-make-screenshots

Can you also send a screenshot of the situation regarding the pop ups in your new screen?please exactly what the message would be please, thank you.

Greetings Firefox volunteer

Modified by Googlethunderbird

more options

We tried literally everything, turned out - ISP blocked ports for whatever reason they had. 5 minute phone call solved the problem. Thanks for the input tho.

more options

Hello there

These issues can be dealt with quite simply by deleting these accounts, requesting new ones and the , it works again. But if you show patience for this situation and can contact your provider to ask what situation it is playing now, fill in the similar SMTP configuration that your provider will have to give you if you have contacted it. The situation you prescribe to us is good but not a problem on our part Thunderbird.

try to reach your email provider Gmail – Google ask for a manager there or first line help for your query to the configuration settings of their SMTP settings for your configuration that they might provide you.


Greetings firefox volunteer.

more options

Hello there


The reason could be that there are more e-mail accounts in your system of 8 PCs that could not have been properly configured or accepted.

You have already been in contact with them, the situation has been clarified on their part, a block for your Port has caused it, okay. You have clearly been assigned a new port number and/or filled in a new configuration

Greetings Firefox volunteer