We have VC managed guest wifi setup however everything is working default email on apple/anroid. I have allowed all the necessary ACL ports such as IMAP, IMAPS,POP,POP3,POP3S,SMTP,gmail,gmail-mobile,webmail to all destination still i when I refresh my app it shows "checking for email" & then error. however as soon as i go back to LTE i started to get email. It's affecting both Gmail, yahoo & our internal Outlook.
Please suggest.