How to find out that SMTP server is in open relay?
An open relay is an email server that allows ANY user , server, etc. to relay through it. An email server that allows authenticated relaying (for example) is not an open relay.
Open SMTP relay error : r/exchangeserver - Reddit
May 17, 2024 · Open relay is a very bad thing for messaging servers on the Internet. Messaging servers that are accidentally or intentionally configured as open relays allow mail from any source to be …
Free or cheap 'Open' smtp relay options? : r/selfhosted - Reddit
Oct 17, 2023 · For free or cheap open SMTP relays, try services like Sendinblue, SMTPget, Sengrid, iDealSMTP or Elastic Email. They offer flexibility for any sender address without domain restrictions. …
Is Office 365 currently allowing open relay? : r/Office365 - Reddit
Sep 5, 2022 · When you send to that address, you are sending to a shared receiving SMTP server that’s intended to receive emails from all sorts of servers without any sort of authentication. Maybe there’s …
smtp - Office 365 Exchange, open relay by default? - Server Fault
I did some more digging and apparently it's not an "open" relay. If you connect to our mail server you can send mail to anyone ON the mail server without authenticating. It seems to be desired behavior …
What are SMTP relays and smarthosts? - Server Fault
Oct 29, 2011 · In general, both are mail relays, and a mail relay is just a server that passes mail to another mail server, via SMTP, rather than a server that offers mailbox service to end users via …
linux - How can I test a SMTP server? - Server Fault
Jan 9, 2021 · I received SMTP server information and credentials and want to test if they work. How can I easily test a SMTP connection on Linux using the command line? I know I can do this via telnet / …
SMTP Server On Premise solution : r/exchangeserver - Reddit
Jan 8, 2023 · Should we build SMTP Server just for this? What are the best solution you can recommend? Share Add a Comment Sort by: Best Open comment sort options Top New …
SMTP connection time over 5 seconds? - Server Fault
Sep 4, 2024 · We're having intermittent problems receiving e-mails from one company, and their side are pointing out, that our server takes just over 5 seconds to respond to incoming SMTP …
Server 2022 SMTP Server issue
Oct 25, 2023 · This is a new installation of Server 2022 Standard 21H2. I'm trying to configure the SMTP Server so that a client application can send emails internally. When I open IIS 6.0 Manager and right …