Accoding to mail.com info located here: https://postmaster.mail.com/en/error-messages 5xy Requested action not taken: mailbox unavailable The specified recipient does not exist on our systems or the recipient has not used their inbox for an extended period of time and the inbox has been temporarily disabled due to inactivity. Please check the spelling of the email address.

Toad-Hall said

Accoding to mail.com info located here: https://postmaster.mail.com/en/error-messages 5xy Requested action not taken: mailbox unavailable The specified recipient does not exist on our systems or the recipient has not used their inbox for an extended period of time and the inbox has been temporarily disabled due to inactivity. Please check the spelling of the email address.

My friend, I have already mentioned that I tried sending to different addresses. So, it cannot be a problem with receiver. Also this is a thunderbird only problem, as I can use the web client and mobile app without any issues.

Have you updated a password in webmail but not updated in Thunderbird? Please check the password and user name settings stored in Thunderbird.

• 'Menu icon' > 'Options' > 'Options' > 'Security' > 'Passwords' tab
• click on 'Saved Passwords' button
• click on 'Show Passwords' button

Does the User Name show correct email address ? Is password correct? check there are no blank spaces at the start or end of password and user name. If not correct, right click on line and use 'Edit Password' or 'Edit Username' as appropriate option If there are hidden blank spaces then the highlighted part will go beyond the text. completely clear content and retype password and or username as appropriate.

• click on 'Close'
• click on 'OK'

If you updated/modified anything...Exit thunderbird Wait a few moments for background processes to complete. Start Thunderbird.

Toad-Hall said

Have you updated a password in webmail but not updated in Thunderbird? Please check the password and user name settings stored in Thunderbird.

• 'Menu icon' > 'Options' > 'Options' > 'Security' > 'Passwords' tab
• click on 'Saved Passwords' button
• click on 'Show Passwords' button

Does the User Name show correct email address ? Is password correct? check there are no blank spaces at the start or end of password and user name. If not correct, right click on line and use 'Edit Password' or 'Edit Username' as appropriate option If there are hidden blank spaces then the highlighted part will go beyond the text. completely clear content and retype password and or username as appropriate.

• click on 'Close'
• click on 'OK'

If you updated/modified anything...Exit thunderbird Wait a few moments for background processes to complete. Start Thunderbird.

No, I have not made any changes anywhere. Again, as I have said, I have been using it without any problems in thunderbird too, until this problem showed up all of a sudden from nowhere

Does your email address and therefore username stored in the passwords section previously mentioned look like this: myname@domain.com or like this: my-name@domain.com

Toad-Hall said

Does your email address and therefore username stored in the passwords section previously mentioned look like this: myname@domain.com or like this: my-name@domain.com

my.name@domain.com

The reason I ask is because I located a similar issue with someone using mail.com Read last comment https://support.mozilla.org/en-US/questions/1169271

Toad-Hall said

The reason I ask is because I located a similar issue with someone using mail.com Read last comment https://support.mozilla.org/en-US/questions/1169271

I have only one account configured and I was successfully using it for some time.

Mozilla88 said

I have only one account configured and I was successfully using it for some time.

This is a common opinion, but the truth is that everyone has two accounts in Thunderbird if the receive and send mail. One incoming account and one outgoing account shown in the Outgoing server SMTP) entry in the account settings. Operating on the understanding they have one account many incorrect assumptions are made.

In this case I think it would be best if you posted the troubleshooting information I request below. At the same time, can you please check in the outgoing server (SMTP that there is but a single account shown and that the account settings match those required by mail.com

Server Name : smtp.mail.com Port: 587 User Name is the same as used for your incoming account. Usually your email address. Authentication Method: Normal Password Connection Security: None

Can you please go to Mail.com web site https://www.mail.com/int/ and send an email to unicorn.consulting@gmail.com. It does not matter really what you send, but send me something, forward the email from the forum asking you to do it would be good enough. But it will at least allow your credential on the web site to be verified. Then go to Thunderbird and attempt to repeat the forwarding excise. Can you do it? Please report your results here in the forum. I am wondering if they need you to send something from their web interface to unlock the sending from a remote client is why I am asking for this weird little exercise.

______________________ oO0Oo ______________________

Please add the troubleshooting information (or at least the Mail and News accounts and Extensions part of it to your post To find the Troubleshooting information:

• Open Help (or click on three-line-icon and select Help)
• Choose Troubleshooting Information
• Use the button Copy to clipboard to select all. Do not check box "Include account names"!
• Paste this in your post.

Please also add the result of these troubleshooting steps to your post

• Does Thunderbird work in TB Safe mode (see Thunderbird Safe Mode)?
• Do you use anti-virus and firewall software? What is the version?

Matt said

Mozilla88 said

I have only one account configured and I was successfully using it for some time.

This is a common opinion, but the truth is that everyone has two accounts in Thunderbird if the receive and send mail. One incoming account and one outgoing account shown in the Outgoing server SMTP) entry in the account settings. Operating on the understanding they have one account many incorrect assumptions are made.

In this case I think it would be best if you posted the troubleshooting information I request below. At the same time, can you please check in the outgoing server (SMTP that there is but a single account shown and that the account settings match those required by mail.com

Server Name : smtp.mail.com Port: 587 User Name is the same as used for your incoming account. Usually your email address. Authentication Method: Normal Password Connection Security: None

Can you please go to Mail.com web site https://www.mail.com/int/ and send an email to unicorn.consulting@gmail.com. It does not matter really what you send, but send me something, forward the email from the forum asking you to do it would be good enough. But it will at least allow your credential on the web site to be verified. Then go to Thunderbird and attempt to repeat the forwarding excise. Can you do it? Please report your results here in the forum. I am wondering if they need you to send something from their web interface to unlock the sending from a remote client is why I am asking for this weird little exercise.

______________________ oO0Oo ______________________

Please add the troubleshooting information (or at least the Mail and News accounts and Extensions part of it to your post To find the Troubleshooting information:

• Open Help (or click on three-line-icon and select Help)
• Choose Troubleshooting Information
• Use the button Copy to clipboard to select all. Do not check box "Include account names"!
• Paste this in your post.

Please also add the result of these troubleshooting steps to your post

• Does Thunderbird work in TB Safe mode (see Thunderbird Safe Mode)?
• Do you use anti-virus and firewall software? What is the version?

Hi,

Sorry for not answering earlier. The problem seems to have resolved on it's own and everything is working fine now. But thank you for your answers.

I found something strange though. I found out that IMAP and POP3 are available only in the paid version of mail.com, but I'm using the free version. I wasn't aware of this when I signed up and configured thunderbird. But it worked then and is still working now. I even tried moving mails from other accounts through thunderbird to the mail.com folder to see if it shows up on the web version, and it does.