Problem with sending email from iPhone

[letsbefair]

Can anyone help me with a problem I'm having sending email from the Webmail account I've put on my iPhone?  It was working fine for several months and now has stopped working. I can receive email that is sent to my Roundcube webmail account, but I can't send from my iPhone.  There are no problems when I use my computer.

The error message I receive is: "Cannot Send Mail.  The server rejected one of the recipient's addresses.  The message has been placed in your Outbox."

I get this error message when I try to send to any email address.  Again, I can email these people from my Roundcube webmail account on a computer.

Also, my .mac email account works with no problems on my iPhone.

Thanks!

[SKaero]

The problem is not related to RoundCube, you should ask your mail provider for help.

[rockfire]

I face the same problem as you, get the to solve the problem?:confused: