550 5.7.1 rABKNJRo031415 This message does not comply with required standards.

I can receive e-mail fine but cannot reply or send new e-mail.

I cannot send an e-mail through Microsoft Outlook 2007 to anyone other than another user within the same domain (in this case "sasktel.net"). The coding after the 550 5.7.1 message changes slightly each time but the result is the same. I have read other posts on this error but none have helped so far. I have tried sending plain text e-mails without any imbedded links but to no avail. Have also talked to SaskTel tech support but no luck there either. I have also tried restoring the default settings to Outlook but that hasn't helped either.

Thanks for your help.
gasfan_canada615Asked:
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AlexiosConnect With a Mentor Commented:
If you did not change anything, you are not using an Exchange and now it works well then possible something is going on with your mail provider company.

Check with them
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AlexiosCommented:
Hello
From the menu Help-About check if you have any service pack installed
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gasfan_canada615Author Commented:
It says SP3 MSO
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gasfan_canada615Author Commented:
Just as mysteriously as it started, I can now send my e-mail once again. I did not change any settings. In fact, I'm not really sure what I did. Reading the blogs, I should add that I am just using an SMTP account; no Exchange server. I tried a plain text e-mail with no hyperlinks but that originally had no impact. This certainly is a mysterious issue to me. Thanks for your suggestions and comments so far.
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AlexiosCommented:
Glad to help
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