![]() ![]() For Email address, enter your full email. Microsoft Outlook or Mozilla Thunderbird). So verify that your firewall or antivirus are not blocking it, setting up a proper exception rule. Ive tried sending test emails to both my Cox and Gmail accounts. Sometimes an outgoing mail server can conflict with the computer’s protection systems. Control your antivirus or firewall settings.You can use then port 587 or 465 for more information read our article about SMTP ports. Problems Logging in to Cox services including Cox Email. user ID By have talked to COX techs and they say they have no problems. The outgoing mail server uses normally port 25, but some ISPs may block it due to the increasing spam traffic that’s been passing through it. Enter programs (like Mailbird, Microsoft Outlook or Mozilla Thunderbird). My Email Cox Net WebmailApple Mail, MS Outlook or Mozilla Thunderbird, might be. Here’s a list of all the SMTP error codes to get your bearings and remember again that using a professional outgoing server this won’t happen again. Now this is trickier: even if your SMTP details are correct, the server itself can be down or not functioning for some reason. Another small mistake that happens usually, so doublecheck your login details. To find out yours, please refer to our list of the most common ones or ask directly your provider. Third-party email clients like Outlook or Apple Mail use POP or IMAP to. ![]() This is an extremely common mistake: you have set up your mail client with the wrong SMTP parameters. Mozilla Thunderbird Authentication Failure while connection to server imap. So first of all, be sure that you’re connected to the internet! That is why it’s always better to rely on a professional SMTP Relay Server, even if you don’t have big mailing needs: for instance turboSMTP offers a handy free plan of 6.000 emails/month, lifetime.Īnd here’s a checklist to understand why you’re unable to send emails and troubleshoot any major problem: If you can’t send your emails, the problem is very likely (but not exclusively) related to your SMTP server – the server taking care of the whole email delivery process. You open your favorite mail client or software (Mozilla Thunderbird, Outlook Express, SendBlaster…), write a few lines, insert the recipients’ addresses, click “Send” and… An error is returned. Both tried, both failed.Sometimes it happens: you simply cannot send emails. Re-reading your info - COX told me to use SSL/TLS security with either port. ![]() Then click on Virus & threat protection Manage settings. If you’re using Windows Security: Navigate to Settings Update & Security Windows Security. If you can send and receive emails with the antivirus and firewall off, whitelist Thunderbird. I had not tried the STARTTLS with 587 combination - THAT WORKED !!! To test if your antivirus or firewall is blocking outgoing emails, simply disable the tools. Using Webmail won't cut it, and I really don't want to use Outlook. Wiki Security Insights Mozilla Thunderbird Sending of the message failed. I use these email addresses for a business that I run, and saving my "sent" emails is important to me. What still makes me suspect COX is they "upgraded" my email service last week, which is usually doublespeak for "we wanted to get rid of something at our end". No Windows updates Saturday afternoon, T'bird itself was updated back in June. As far as I can tell, nothing changed at my end. All to no avail.ĬOX is essentially saying "sending by webmail works fine, so the problem is not at our end". I can receive incoming emails using Thunderbird but cannot send emails, and I can both receive and send emails using Outlook. I changed my password as a last attempt to fix this last night, thinking perhaps it had expired (though receiving emails is working fine). 1 reply 0 have this problem 7 views Last reply by david 3 days ago hklesserjr 7/26/23, 2:10 PM more options I use both Thunderbird and Outlook for my cox.net email account. 465 with SSL/TLS, and, normal password, and username as the first part of each email address. Thanks for taking the time to reply, much appreciated.Īll my settings are as you described. ![]()
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