Why does koodo block outgoing mail from videotron email address?

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I have an iphone 6s and my phone is unable to send out emails from my videotron email address unless I'm on wifi. Why does Koodo LTE service block outgoing mail?
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Posted 2 years ago

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Timo Tuokkola, Mobile Master

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A lot of providers block outgoing mail from third party servers on port 25 to help reduce spam over their networks. On an iphone you should be able to setup multiple fallback smtp servers. Setting up smtp.telus.net as a secondary outgoing server would mean it uses that one automatically if the connection to the videotron server fails.