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Fix typo in README.md

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@ -26,7 +26,7 @@ All standard caveats of configuring the SMTP server apply:
- **MAKE SURE YOUR OUTGOING PORT 25 IS NOT BLOCKED.**
- Most ISPs block outgoing connections to port 25 and several companies (e.g. [NoIP](https://www.noip.com/blog/2013/03/26/my-isp-blocks-smtp-port-25-can-i-still-host-a-mail-server/), [Dynu](https://www.dynu.com/en-US/Blog/Article?Article=How-to-host-email-server-if-ISP-blocks-port-25) offer workarounds).
- Hosting centers also tend to block port 25, which can be unblocked per requirst (e.g. for AWS either [fill out a form](https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/) or forward mail to their [SES](https://aws.amazon.com/ses/) service, which is free for low volumes)
- Hosting centers also tend to block port 25, which can be unblocked per request (e.g. for AWS either [fill out a form](https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/) or forward mail to their [SES](https://aws.amazon.com/ses/) service, which is free for low volumes)
- You'll most likely need to at least [set up SPF records](https://en.wikipedia.org/wiki/Sender_Policy_Framework) or [DKIM](https://en.wikipedia.org/wiki/DomainKeys_Identified_Mail)
- If using DKIM (below), make sure to add DKIM keys to your domain's DNS entries
- You'll most likely need to set up [PTR](https://en.wikipedia.org/wiki/Reverse_DNS_lookup) records to prevent your mails going to spam