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cannot send e-mails

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Hi I can receive e-mails no problem, but I cannot send messages on a priodic basis. I more often than not receive a message that informs me Login to my mail server has failed. My firewall allows Mozilla Thunderbird. All my outgoing SMTP settings are correct. Please help....

Hi I can receive e-mails no problem, but I cannot send messages on a priodic basis. I more often than not receive a message that informs me Login to my mail server has failed. My firewall allows Mozilla Thunderbird. All my outgoing SMTP settings are correct. Please help....

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