11 Feb 2022
It happens from time to time that you are unable to send an email. You open your preferred mail client or software (Mozilla Thunderbird, Outlook Express, SendBlaster, etc. ), type a few lines, enter the recipients' addresses, click "Send," and... an error message appears.
If you're having trouble sending emails, it's most usually (but not always) due to an issue with your SMTP server, which handles the entire email distribution process. That's why, even if you don't have a lot of emails, it's always best to use a professional server: turboSMTP, for example, has a useful free plan that allows you to send 6.000 emails per month for the rest of your life.
Why am I unable to send attachments?
Why can't I open the attachment my sister sent me?
Passwords for email
Why does Webmail make things so complicated?
What's the deal with my Outbox being full of mail?
I received an email stating that my mail to someone could not be sent, despite the fact that I had not sent it. Is it possible that I'm infected with something?
Here's a list to help you figure out why you can't send emails and how to fix any big issues:
Make sure your internet connection is working. Yup. It happens all the time. First and foremost, make sure you're connected to the internet!
SMTP port must be changed. The outgoing mail server typically utilizes port 25, but due to the increased spam traffic that has been traveling through it, some ISPs may decide to ban it. Then use port 587 or 465; see our page on SMTP ports for further information.
It is necessary to update the SMTP port. Although port 25 is normally used by the outgoing mail server, some ISPs may elect to block it due to the increasing spam traffic that has been passing through it. Then use port 587 or 465; for more information, read our SMTP ports page.
Check the information on your SMTP server. This is a very typical blunder: you've configured your mail client with the incorrect SMTP parameters. To find out what yours is, look through our list of the most popular ones or ask your provider directly.
Check all of your usernames and passwords to be sure they're correct. Another common blunder so double-check your username and password.
Control the settings of your antivirus or firewall. An outgoing mail server can sometimes interfere with the computer's security systems. As a result, make sure your firewall or antivirus isn't obstructing it by creating a valid exception rule.
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