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https://mxtoolbox.com/diagnostic.aspx
ABOUT SMTP DIAGNOSTICS. This test will connect to a mail server via SMTP, perform a simple Open Relay Test and verify the server has a reverse DNS (PTR) record. It will also measure the response times for the mail server. If you don't know your mail server's address, start with a MX Lookup.
https://email-checker.net/
Email Checker is a free email verification tool. It helps you validate any email address online for free. Check if mailbox really exists.
https://www.mailtester.com/
Check if an e-mail address is valid or not. Find out why a mail bounces. Get technical information about a mail account and it's mail (SMTP) server.
http://mail-server-test.online-domain-tools.com/
Basic information about achieving a high delivery rate can be found in our blog post How to setup your own mail server that will deliver. The Mail Server Test tool can help mail admins with the task by automatically checking the configuration of relevant DNS records and industry best practices for mail servers configuration.
https://informeddelivery.usps.com/box/pages/intro/start.action
Informed Delivery provides eligible residential consumers with a digital preview of their household's incoming mail scheduled to arrive soon.* Users can view greyscale images of the exterior, address side of incoming letter-sized mailpieces (not the inside contents) via email or an online dashboard. Check out our FAQs for more details.
https://docs.microsoft.com/en-us/exchange/troubleshoot/mail-delivery/email-delivery-issues
Mar 26, 2020 · Check the service health page for progress updates. In this case, you don't need to open a service request because CompanyName is already working to resolve the issue. Use message trace for in-depth email delivery troubleshooting - 15 minutes
https://exchange.nagios.org/directory/Plugins/Email-and-Groupware/check_email_delivery/details
Includes check_smtp_send, check_imap_receive, and check_email_delivery which checks the complete delivery loop using the smtp and imap plugins. You can use check_smtp_send and check_imap_receive independently, and you can use check_email_delivery to check that an email loop is working. Features of check_smtp_send: * custom headers
https://support.office.com/en-us/article/Sent-email-in-Outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062
Delivery failures, or emails that bounce or come back as undeliverable, can happen for several reasons. When you send an email and receive a delivery failure message, there could be several reasons.
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