Kindly follow the below settings to configure the webmail account in email client.

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Username : Full email address
Password : Correct webmail password

Select POP3

Incoming mail server : hostname    (or)     mail.yourdomainname.com
For POP3 use 110 - SSL Disabled      ( If SSL enabled Use 995)

Outgoing Mail server : hostname    (or)      mail.yourdomainname.com
Outgoing SMTP port - 25 or 587 or 26 ( If SSL enabled use 465)
SSL Disabled or None

In More or Advanced Settings - Select SMTP Authentication Enabled
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