diff --git a/README.md b/README.md
index 191588a..e51a7b5 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ same setup time and time again.
 I've linked this file on Github to a shorter, more memorable address on my
 website so you can get it on your machine with this short command:
 
-```
+```sh
 curl -LO lukesmith.xyz/emailwiz.sh
 ```
 
@@ -18,7 +18,7 @@ give your full domain without any subdomain, i.e. `lukesmith.xyz`.
 
 - **Postfix** to send and receive mail.
 - **Dovecot** to get mail to your email client (mutt, Thunderbird, etc.).
-- Config files that unique the two above securely with native log-ins.
+- Config files that link the two above securely with native log-ins.
 - **Spamassassin** to prevent spam and allow you to make custom filters.
 - **OpenDKIM** to validate you so you can send to Gmail and other big sites.
 
@@ -128,3 +128,5 @@ support me at [lukesmith.xyz/donate](https://lukesmith.xyz/donate.html).
   worry if you are: sometimes especially new domains are automatically assumed
   to be spam temporaily. If you are blacklisted by one of these, look into it
   and it will explain why and how to remove yourself.
+- Check your DNS settings using [this site](https://intodns.com/), it'll report any issues with your MX records
+- Ensure that port 25 is open on your server. [Vultr](https://www.vultr.com/docs/what-ports-are-blocked) for instance blocks this by default, you need to open a support ticket with them to open it. You can't send mail if 25 is blocked
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