E-mail won't send with wifi

I can receive all e-mails from my office server (microsoft exchange), but I can only send e-mails when wifi is turned off. The error message says that the connection to the cwmx.com server failed. Can you help? Thanks.

Does your office email account have an authenticated SMTP server?
If not, you will have problems sending messages with this account when not connected to your company's network. Internet Service Providers impose restrictions on using an SMTP server that is outside of their network on Port 25 which is the default port for SMTP servers. Most ISPs allow the use of an authenticated SMTP server that is outside of their network on Port 25 but some block its use regardless. These restrictions are in place as part of an overall effort to prevent spam emanating from the ISP's domain but as with just about anything else, it is usually the few that take advantage of a situation for not above board deeds that spoil it for everyone else that need to use it for legitimate reasons.
You can try using 587 for the SMTP server port but having an authenticated SMTP server is the ticket. I access a .Mac account and a business POP account with my iPhone. Both have authenticated SMTP servers and I haven't had any trouble sending messages with either account regardless how or where I'm connected - via various Wi-Fi networks or EDGE.

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