Help Suddenly unable to send outgoing mail

[DeniseAK]

Hi, I have a Galaxy SII and am suddenly unable to send mail and get a connection error message.
When I got to settings for outgoing messages I get Cannot connect to server (500 Authentication Denied (VM320).
Does anyone know what this means or what to do about it?
I can receive mail (ntl) fine but just can't send it on wifi or data plan.
I changed my password yesterday but have sent mail since then without problem so don't know what's changed today.
I can't change outgoing settings either as I get a cannot connect to server message.
Any help would be much appreciated!
Thanks.

 

[bhero]

Its unclear if you changed your password and then had trouble or what client your using or what ISP. SMTP servers send mail to people and they have rules. I would remove and re-add the email account.

On a side note I get these notices from time to time on my yahoo or my hotmail account ...bad password. I learned to ignore them an usually within a few hours it disappears with me doing nothing.