Knowledgebase
Knowledgebase: Linux Website Hosting
Can recieve but not send email
Posted by Tim Botherway on 27 March 2018 11:39 AM

After you've configured your mail client software, you may find you're able to receive email but not send.  There a few scenarios which can cause this to happen which we will cover below.

Scenario #1: Your IP is blacklisted

This happens for about 80% of the issues we come across.  You suddenly find that you can no longer send, even though yesterday it was working fine.  This reason for this may be due to your internet connection allocating you a dirty / blacklisted IP.  This happens where a customer from the same ISP you use, intentionally/unintentionally sent out a whole bunch of spam and had that IP flagged as a spammer and later disconnected their router, now you've come along and connected to your router and have been assigned that IP address that was used to spam, so you are now flagged and blocked for sending email.

You can confirm if you're blacklisted by doing the following:

1) Going to an online tool Whats's My IP (www.whatsmyip.com) and taking note of what your IP address is.
2) Using an online blacklist checker like MxToolBox (mxtoolbox.com/blacklists.apx) and running a query to see if you're on any blacklists.

In the results it will clearly outline if you're on a blacklist and how many.  The main ones you want to avoid is Spamhaus, Barracuda, Spamcop, SORBS.

How to resolve?

You can resolve this by simply changing your IP address.  If you're on a residential dynamic connection, it means that your IP will change everytime you reconnect your router.  So if you go and turn off your router for 5 minutes and turn it back on you should connect with a new IP.  You can then do the following steps above to confirm you have a clean IP.  It's not always gauranteed to work resetting your router, so you may need to call your ISP for further assistance.

If you're on a static/dedicated IP, you may want to speak to your ISP or whoever manages your IP address, they will need to go through the correct process and get the IP removed from spam registrys

 

Scenario #2: Email client not configured correctly

You will want to run through our Openhost email settings guide guide again and ensure you've set the correct port numbers, listed in priority of preference we would make sure we use the following for sending:

Server: directserver (e.g linuxplesk) | Port: 465 | Encryption: SSL
Server: directserver (e.g linuxplesk) | Port: 587 | Encryption: TLS
Server: mail.<domain> | Port: 465 | Encryption: SSL
Server: mail.<domain> | Port: 587 | Encryption: TLS

Sometimes your client software will try to set your port as 25 by default.  This port can be blocked by your ISP and can't be used, but may work for some network connections, dependant on your ISP.

 

Scenario #3: Authentication not enabled for sending

If you find you've setup your connection, and you go to send an email and you instantly get a bounceback message stating "Relay not permitted".  This means that you've forgotten to enable authentication for sending in your client software.  You will need to go to the SMTP settings of your client and ensure you are using your email address and password to authenticate, you can find this setting in some clients below:

Outlook (File >> Account Settings >> Click on the account and go 'Change' >> More Settings >> Outgoing Server tab):

MacMail (Mail >> Preferences >> Accounts >> Select the account >> Under Outgoing Mail Server (SMTP) Account: dropdown, select "Edit SMTP Server List' >> Ensure a Username and password is filled out for Server Settings):

 

 

 

 

 

 

(2 vote(s))
Helpful
Not helpful