Contribute  :  Calendar  :  Advanced Search  :  Site Statistics  :  Directory  :  Files to download  :  Links for developers  :  Privacy policy  :  Web Resources  :  Polls  
    MacOSX Guru Site Information, tips and tricks, FAQ for Mac OS X developers    
 Welcome to MacOSX Guru Site
 Friday, April 19 2019 @ 08:09 AM BST

Problem with your ISP mail relay not recognized anymore ?

OS X FAQYou are hit by an error telling you that your ISP mail relay doesn't respond anymore when it had always worked before ?

Think to flush the DNS cache…

Either by changing the DNS settings in System Preferences/Network… (remove the IPs in DNS field, click Apply, …)

Either by executing in Terminal (for Leopard)

sudo dscacheutil -flushcache
Maybe not the solution to all the use cases, but this saved some days here… For those of you beaten by the upgrade to Snow Leopard and the "not able to send mails anymore" problem, here is our advice:

1. look at your ISP possible settings and if your ISP allows SMTP connection with authentication use this configuration instead of the classical "no authentication" one used by most people having a DSL connection for which authentication is implied by the fact to be physically wired to the ISP…
2. among the authentication methods allowed, give priority to the most secure one (with SSL if allowed by your ISP)
3. in case no SMTP with authentication is available, force the port to 25 instead of the automatic discovery mechanism
4. always end-up the modification of settings by leaving, flush the DNS cache in Terminal and re-lauch again.

What's Related

Story Options

Problem with your ISP mail relay not recognized anymore ? | 0 comments | Create New Account
The following comments are owned by whomever posted them. This site is not responsible for what they say.
 Copyright © 2019 MacOSX Guru Site
 All trademarks and copyrights on this page are owned by their respective owners.
Powered By Geeklog 
Created this page in 0.11 seconds