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Outbound msgs failing need to change port to comcast 587 - Tried to change to no avail. Comcast says it's a Thunderbird fix

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Using Moz Thunderbird with Win7 I'm accessing my email on a comcast mail server. Inbound msgs are fine but I've lost the ability to send outbound traffic (except direct from comcast webmail) Settings are correct (port 465 for outbound according to most recent articels on the subject). i called comcast ant they recommend using port 587 instead. Made the switch to no avail as the default remains at 465 even after changing it. Is there a fix for this?

Using Moz Thunderbird with Win7 I'm accessing my email on a comcast mail server. Inbound msgs are fine but I've lost the ability to send outbound traffic (except direct from comcast webmail) Settings are correct (port 465 for outbound according to most recent articels on the subject). i called comcast ant they recommend using port 587 instead. Made the switch to no avail as the default remains at 465 even after changing it. Is there a fix for this?

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I am confused.

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