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Unable to Send Out Emails (SMTP Connection Issue) But Can Receive

  • 7 replies
  • 1 has this problem
  • 46 views
  • Last reply by info5825

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Hi all,

I would be grateful for your speedy help as we are a healthcare business.

This morning I noticed I was unable to respond to any emails, although we've had no trouble receiving them.

There's an issue with connection to the Thunderbird servers (spoke to our IT team and they said I need to get help from Thunderbird).

I've attached a screenshot of our server settings (hope it's ok I've blanked out our names). Here is the error code, pasted below: "Sending of the message failed. Failed due to unexpected error 80004005. No description is available. The message could not be sent using Outgoing server (SMTP) mail.rugbydentalcare.co.uk for an unknown reason. Please verify that your Outgoing server (SMTP) settings are correct and try again.'

Is anyone able to help?

Thank you kindly

Attached screenshots

All Replies (7)

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Your picture shows the incoming settings. Click on Outgoing Server (SMTP) at the bottom of the left pane. Based on the incoming data, the outgoing server probably is mail.rugbydentalcare.co.uk on 465, SSL/TLS, or 587, STARTTLS.

What's the antivirus and its mail settings? Scanning of outgoing mail should be disabled and the profile folder added as an exclusion or exception.

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sfhowes said

Your picture shows the incoming settings. Click on Outgoing Server (SMTP) at the bottom of the left pane. Based on the incoming data, the outgoing server probably is mail.rugbydentalcare.co.uk on 465, SSL/TLS, or 587, STARTTLS. What's the antivirus and its mail settings? Scanning of outgoing mail should be disabled and the profile folder added as an exclusion or exception.

Thanks for your help - all seems ok based on your checklist. I changed the authentication method to 'no authentication' as it was on a password before just in case. As the problem is it would keep asking repeatedly for our account password when attempting to email out - but this change didn't do anything.

Do you have any other ideas at all? This all happened very suddenly so it's hard to pinpoint...

I've attached more screenshots.

Thank you

Modified by info5825

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sfhowes said

Your picture shows the incoming settings. Click on Outgoing Server (SMTP) at the bottom of the left pane. Based on the incoming data, the outgoing server probably is mail.rugbydentalcare.co.uk on 465, SSL/TLS, or 587, STARTTLS. What's the antivirus and its mail settings? Scanning of outgoing mail should be disabled and the profile folder added as an exclusion or exception.

Hi thanks for your help. All seems ok in terms of settings, the only thing I did test was changing the authentication method to 'no authentication' as it was on a password before (and Thunderbird would repeatedly ask for the account p'word when attempting to mail out). This hasn't changed anything.

I've attached more screenshots if you don't mind checking these out.

This has all happened out of the blue so it's difficult to pinpoint...

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So since changing the authentication method, I've found emails seem to be sending but this pop-up comes up before it does:

An error occurred while sending mail: The mail server sent an incorrect greeting: The server has reached its limit for processing requests from your host. Please try again later..

Is this something we'll have to put up with now do you think in order to email out?

Thanks

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An error occurred while sending mail: The mail server sent an incorrect greeting: The server has reached its limit for processing requests from your host.

That error says nothing is going out. If your server requires a password and most do changing the settings to not require one will often get this error as the number of outgoing mail you are entitles to send without authentication is Zero.

After some fairly extensive testing of the server reporting the errors. mail.rugbydentalcare.co.uk which you can view here https://www.immuniweb.com/ssl/mail.rugbydentalcare.co.uk/6JyTZNVF/

I would guess you should have the connection security set to either StartTLS or SSL/TLS (probably SSL/TLS but try startTLS first) with authentication method Normal password on port 25

I do encourage you to look over the results as the mail server fails the Paymant card indistry standard by including TLS V1 still. I have no idea how this would affect the transmission of card data vie email. Perhaps nothing but I thought I should draw your attention to it.

The web server does not and also supports tls V1.3 which the mail server does not.

I also tested the web site in the first instance through error and those result are here https://www.immuniweb.com/ssl/mail.rugbydentalcare.co.uk/4p6iUu1N/ as you said you run the service it might also be of interest.

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What are the settings recommended by your web host? If the SSL settings for the incoming worked before, it's unlikely that the outgoing server works on port 25 with no connection security and no authentication. 'Incorrect greeting' usually means the authentication method or password is wrong. It was asked before: what is the antivirus? Sometimes, these AV apps update and make previously-working setups fail.

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Hi both, just to say thank you very much for your detailed and fast responses. I'll be honest the technical stuff did go over my head a little so it prompted me to reach out to another IT team who managed to solve this. It was a case of our servers migrating to another server. Thank you again

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