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Knowledgebase
You are here: Portal Home > Knowledgebase > Email Issues > Email sending issues
The knowledgebase is organized into different categories. Either choose a category from below or search the knowledgebase for the answer to your question.
Articles
Cannot send attachmentsYou might not be able to send mails with attachments because of: 1. A local antivirus /...
Views: 5775
Cannot send email using EudoraThe most common reasons for not being able to send emails through Eudora are wrong Eudora...
Views: 7194
Cannot send emails using Mozilla ThunderbirdThe most common reasons for not being able to send emails through Thunderbird are wrong...
Views: 17015
Cannot send emails using OutlookThe most common reasons for not being able to send emails through Outlook are wrong Outlook...
Views: 12099
Cannot send emails using Outlook ExpressThe most common reasons for not being able to send emails through Outlook Express are wrong...
Views: 45068
Error 503: Valid RCPT command must precede DATAThe most common reason for this error is an incorrectly configured mail client.In order to solve...
Views: 18930
Error 553: Unable to verify addressWhen you receive a message saying "unable to verify address", please make sure that you have...
Views: 5479
Error: 'Retry time not reached for any host'This error message means that a previous attempt to deliver the mail has failed with a temporary...
Views: 5025
Error: 'The connection to the server was interrupted'The most common reason for this error is network or local connectivity issue. If you receive it...
Views: 1667
Error: 'Too many recipients'The "Too many recipients" error will be displayed when: an email message has...
Views: 6510
Error: Could not complete sender verifyThis is a common issue which happens when using the cPanel username for authenticating on the...
Views: 2773
Error: Invalid HELOThe message "invalid HELO command" means that the application you are using for sending mails...
Views: 2164
Formmail RedirectIf you are using FormMail in a web form, you might wonder how to redirect the visitor to a custom...
Views: 3328
How to check whether SMTP port 25 is blocked?The standard port used for SMTP connections is 25. One of the most common reasons for not being...
Views: 126971
I receive Unroutable address bounce back error message.The error "Unroutable address / Unroutable mail domain" is a general error which can be caused by...
Views: 8136
IP has been blacklisted by an antispam organizationIf you receive a bounced-back message saying that IP address X.X.X.X is blacklisted by a spam...
Views: 1253
My mobile device cannot send mailsThis issue is usually caused by the fact that your mobile operator has filtered the outgoing smtp...
Views: 1219
The SMTP server is refusing my connection attemptsSome Internet Service Providers are blocking the standard SMTP port (25 port) to prevent...
Views: 11902
The SMTP server is rejecting my password/loginTo avoid problems during logging to your SMTP server you should make sure that your mail client...
Views: 8011
What is the MTA retry timeout on your servers?The retry timeout setting defines how often the MTA (Mail Transfer Agent) will try to deliver...
Views: 2360
What to do if you receive an error: 'Outlook reports: Sending and receiving reported error (0x800CCC65)'If you receive the following error in your Outlook application:Outlook reports: Sending and...
Views: 3349
Which SMTP port to use?No matter which SMTP port you use your mails will be sent in exactly the same way. We recommend...
Views: 33898
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