Sender FAQ

Answers to your most common questions about Sender.

Quick, simple, and helpful information at a glance.

What does "undeliverable" mean when I try to send an email?
"Undeliverable" means that your email was unable to reach its intended recipient.
Why do I keep getting a "delivery failure" message when sending emails?
A delivery failure message means that your email was not successfully delivered to the recipient's email server. This could be due to a variety of reasons, such as a full inbox or an incorrect email address.
Why can't I send emails to a certain recipient?
There could be several reasons for this, including the recipient's email server being down, their inbox being full, or their email address being incorrect.
What does the error message "SMTP server not responding" mean?
This means that the server responsible for sending your email is not responding. This could be due to a technical issue or your internet connection being down.
How can I fix the "mailbox full" error message?
To fix this error, you will need to free up space in your email inbox by deleting unnecessary emails or archiving old emails.
Why do I keep getting a "server error" when sending emails?
A server error can occur for various reasons, such as a problem with your internet connection, an issue with the email server, or incorrect server settings.
What does the "authentication failed" error mean?
This means that the email server was unable to verify your login credentials. Double check your email and password to make sure they are correct.
How do I resolve the "connection timeout" error when sending emails?
This error means that your email server took too long to respond. Check your internet connection and try again later.
Why do I see the "message blocked" error when sending an email?
Your message may have been blocked by the recipient's email server due to a possible spam or security issue. Check with the recipient to ensure they are able to receive emails from you.
What is a false positive in email blocking?
A false positive occurs when legitimate messages are mistakenly marked as spam and blocked by the email server.
Why is my message going to the recipient's spam folder?
Your message may be going to the spam folder if it contains certain keywords or phrases that the recipient's email server deems as spam. Avoid using spam-like language and ask the recipient to add you to their contact list.
How can I prevent my emails from being marked as spam?
Avoid using spam-like language and ask your recipients to add you to their contact list. Additionally, regularly clean out your email list to avoid sending messages to inactive or outdated email addresses, which can raise red flags for email servers.
What does the error message "no valid recipients" mean?
This means that your email did not have any valid recipients listed. Double check the email addresses you entered and try again.
How do I fix the "unrouteable address" error?
This error occurs when an email address is no longer in use or is invalid. Make sure to double check the email address and try again.
Why do I keep getting a "send/receive error" when trying to send emails?
This error can occur due to several reasons, such as incorrect server settings, a problem with your internet connection, or a temporary issue with the email server.
What is an email bounce?
An email bounce occurs when your email is returned to you without being delivered to the intended recipient. This can happen due to various reasons, such as a full inbox, an inactive email address, or a technical issue.
How do I troubleshoot email sending issues?
Some steps to troubleshoot email sending issues include checking your internet connection, verifying server settings, checking for any email server updates or outages, and ensuring the recipient's email address is correct.
What does the error message "mailbox unavailable" mean?
This error means that the mailbox you are trying to send an email to is no longer active or has been deleted.
How can I fix the "SMTP authentication failed" error?
This error means that the email server was unable to verify your login credentials. Double check your email and password to make sure they are correct, and try again.
Why is my email stuck in the outbox?
This could be due to a slow or unreliable internet connection, incorrect server settings, or an issue with your email program. Check your internet connection, verify your server settings, and try again. If the issue persists, try using a different email program.
What does the "mailbox quota exceeded" error mean?
This error means that the recipient's email inbox has reached its maximum storage capacity and can no longer receive new emails. Ask the recipient to free up space in their inbox or contact their email provider for assistance.
How can I fix the "DNS entry not found" error?
This error means that the recipient's domain does not have a DNS entry, which is necessary for email delivery. Contact the recipient's email provider for assistance in creating a DNS entry for their domain.
Why do I get a "server connection timeout" error when sending emails?
This error can occur due to a slow or unstable internet connection, server issues, or incorrect server settings. Check your internet connection and verify your server settings before trying again.
How can I fix the "mail server not responding" error?
This error means that your email server is not responding. Check your internet connection and try again. Contact your email provider if the issue persists.
What does the error "550 mailbox not available" mean?
This error means that the recipient's email address is no longer in use or does not exist. Double check the email address and try again.
How do I resolve the "outgoing server requires authentication" error?
This means that you need to enter your login credentials before sending emails. Make sure to enable SMTP authentication in your email program settings and enter your email and password correctly.