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Cannot send email
If the email failing to send has a large file attachment, try sending a test email with no attachments. Generally, a file attachment should not exceed 20MB in size. Note: If you need to send larger files over the internet, consider a file sharing service such as Hightail.
Port & security type: 587 & SSL (for Apple devices) or STARTTLS/TLS (for all other devices) Authentication/password: Yes - use your email address as the username, and your email password
If you decide to recreate your email account or “start from scratch”, you should not delete your original accountsetup unless you have already saved all important emails to your computer’s Desktop or hard drive.
Run an Antivirus or malware scan using your Antivirus software. Please contact your Antivirus software’s Customer Support if you're not sure how to do this.
Temporarily disable any firewall, antivirus or anti-malware software and attempt to browse again. Please contact your security software’s Customer Support if you're not sure how to do this, or you need help changing the software settings to allow emails.