Error Send e-mail by webmail

[renanpro03]

Hello everyone, I am getting this error "Error SMTP (-1): Connection to the server failed." (attached image) ONLY to send email through webmail, sending through Outlook works normally.

Anyone know how to fix this? Maybe updating to version 0.5.3?
Thanks!
[ATTACH=CONFIG]1721[/ATTACH]

[JohnDoh]

have you put the correct server address in your config? have you checked there are no connection restrictions or firewalls blocking the connection?