Glenn is most likely right.
Telus, Shaw and other big ISP's block port 25 (SMTP). See if the company that has your domain offers an alternative IP. I am a hosting company myself, and I offer port 587 as the alternate to my customers for smtp connections, which the ISP's do not block.
If they do offer this, then change the port for smtp and setup authentication to use the POP3 username and Password, you should be good to go, and never have to change it again.
Good luck!
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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