Email client login not working

[#1]

Login to the email server by email clients on both my Samsung phone and iPad not working.  We mail is working.

[#2]

Same here. Has happened within the last 24 hours. Webmail is fine (on phone or laptop), thunderbird is fine (on laptop), gmail app (on Samsung phone) is not. Same on my wife's Samsung phone gmail app. My phone says the app was updated 4 days ago, but it has worked since then.

[#3]

I'm getting the following error since about 1am this morning:

Warning    Error returned by the POP3 server for mailbox account+mailbox on server mail.force9.net. Details:
-ERR internal server error

[#4]

@Gilgamoth - which email client?

@stumped - which email brand?

Try this diagnostic in a POWERSHELL window - substitute your credentials for userID and type your password at the prompt (not echoed).

curl.exe -v pop3s://mail.force9.net -u userID

[#5]

It's a POP3 downloader for a local mail server, been working for years

PS C:\Users\> curl.exe -v pop3s://mail.force9.net -u mailbox+user
Enter host password for user 'mailbox+user':
*   Trying 91.204.208.196:995...
* Connected to mail.force9.net (91.204.208.196) port 995 (#0)
* schannel: disabled automatic use of client certificate
< +OK POP3 ready <1901387638.1745420408@mail.enmail.co>
> CAPA
< +OK Capability list follows
< TOP
< USER
< UIDL
< SASL PLAIN LOGIN
< .
> AUTH PLAIN
< +
> xxx=
< -ERR [AUTH] Authentication failed.
* Closing connection 0
* schannel: shutting down SSL/TLS connection with mail.force9.net port 995
curl: (67) Login denied

I'm noting that it says "-ERR [AUTH] Authentication failed", however this is the username and password that I can log into webmail with

Moderators Note: Personal information removed

[#6]

Can you please retry that using the email address as the ID.

Are there any special characters in the password, if yes, which please.

Also is your userID of the ilk of account+forename.surname that is the is a "." in the mailbox name?

[#7]

Getting the same
PS C:\> curl.exe -v pop3s://mail.force9.net -u address@account.f9.co.uk
Enter host password for user 'address@account.f9.co.uk':
*   Trying 91.204.208.196:995...
* Connected to mail.force9.net (91.204.208.196) port 995 (#0)
* schannel: disabled automatic use of client certificate
< +OK POP3 ready <1359164678.1745422408@mail.enmail.co>
> CAPA
< +OK Capability list follows
< TOP
< USER
< UIDL
< SASL PLAIN LOGIN
< .
> AUTH PLAIN
< +
>=
< -ERR Login failed.
* Closing connection 0
* schannel: shutting down SSL/TLS connection with mail.force9.net port 995
curl: (67) Login denied

Password has no special characters, just letters and numbers

Moderators Note: Personal information removed

[#8]

Ref edit to my previous post - is there a full stop in the address part of your email address?

[#9]

Sorry I missed that question, yes there are two full stops in the address part of the email address, however my wife's mailbox on the same account, doesn't have any and I'm getting the same -ERR Login failed, which is different from the Authentication Failure from before

[#10]

Full stop in the mail address now has an open incident.

Wife's mailbox does the command work using here email address?  Can you confirm that she can login using webmail?

Really appreciate your assistance here.

[#11]

Wife's account gets exactly the same error
Enter host password for user 'user@account.f9.co.uk':
* Host mail.force9.net:995 was resolved.
* IPv6: (none)
* IPv4: 91.204.208.196
*&nbsp;&nbsp; Trying 91.204.208.196:995...
* schannel: disabled automatic use of client certificate
* Connected to mail.force9.net (91.204.208.196) port 995
&lt; +OK POP3 ready &lt;843402602.1745424243@mail.enmail.co&gt;
&gt; CAPA
&lt; +OK Capability list follows
&lt; TOP
&lt; USER
&lt; UIDL
&lt; SASL PLAIN LOGIN
&lt; .
&gt; AUTH PLAIN
&lt; +
&lt; -ERR Login failed.
* closing connection #0
curl: (67) Login denied
&nbsp;
I've even tried using the address of .force9.co.uk instead of .f9.co.uk
&nbsp;
Edit: Yes we can both use webmail with no problems

Moderators Note: Personal information removed

[#12]

My email brand is Force9 - which I notice Gilgamoth's is too. Co-incidence maybe but worth a look?

My email address does not have a "." before the "@" BTW. FWIW it is a catch-all address.

[#13]

Try logging in using the account name.

[#14]

OK... that worked.

To add more detail (possibly not of any use but just in case) it worked in the sense of messages are now being received. Despite this there was still an error message at the top of the gmail screen asking me to sign in. This went away when I restarted the app.

As my wife uses an alias address, ie "wifeyname@username.f9.co.uk" this won't work for her (unless I'm missing a trick).

[#15]

If wifyname delivers to yourname, then no it will not work because that’s not the true name of the mailbox.

In other words you share ONE mailbox having dual personalities.