Can't send mail to Hotmail because my IP is on a blocklist

Question

When I try to send email from local mail server to Hotmail, the message is not being received by the hotmail account because my mail server IP address is listed in the XBL list.

How can I remove my mail server from the Hotmail XPL list?

Answer 1

If you are trying to send from a home-class Internet service using a DHCP IP address, the entire subnet has been listed as DHCP by your ISP (they are required to do this), and that has been picked up by the blacklists. If you have a DHCP IP address, another major issue is that your PTR DNS record (used to make sure that you are who you say you are, and not a spammer, who is relaying) does not refer back to your mail server, but to your ISP's DNS host name they have given your IP address. That problem will also get your mail blackholed at Hotmail and AOL, among others.

In that case, your only option is a "smarthost", which is a relay that you send your mail through, and it delivers it on your behalf. These are not blacklisted and are configured with a proper PTR record, so the mail goes fine. Your ISP may have an SMTP server smarthost that you can relay though, but unless you have a business account (I actually have a business-class Internet package that I use with DHCP and DDNS, so I relay through their business-class SMTP relay smarthost), SMTP servers for home-class Internet packages have all but gone away.

If that is the case, you Google "smtp relay service" (minus the quotes), and find one that you can pay for. They are typically $20-$50 per year.

I have been doing IT professionally for 17 years, but e-mail is my specialty.

Answer 2

Check if you're listed here: Spamhaus Blocklist Removal Center. There's another blocklist checker here.

Note that Microsoft says:

If Microsoft believes that unauthorized or improper use is being made of any Service, it may, without notice, take such action as it, in its sole discretion, deems appropriate, including blocking messages from a particular internet domain, mail server or IP address.

So basically, you probably did something wrong.

If you are blocked, go through the removal process, but I'd strongly suggest checking whether one of your computers is infected and sends out spam without your knowledge. There is a reason why you're on a blocklist.

Answer 3

If you're on a blacklist you're either sending spam, or sharing a subnet with someone who is.

Since you mention using a local mail-server it sounds like your ISP has chosen not to block outgoing SMTP-traffic, which makes it all the more likely that a malicious (or virus-infested) user was sending out enough spam for the subnet to be blacklisted.

First of all, check a couple of public blacklists for your IP-address (I highly recommend using this tool.) If you're listed you should find an SMTP relay, your ISP probably provides one.

Answer 4

the reason for this is because you are sending the mail from your localhost via the ISP. a lot of spammers do this. this is the reason why dynamic sub-nets of ISPs are on the "black list" for outgoing e-mail.

because this is a security setting handled by the service provider, you have to check with hotmail directly.

you could start here

• http://mail.live.com/mail/troubleshooting.aspx

note:
alternatively, you can do the folowing:

• use a mail server from a "white list" IP (which is not published either).
• relay your mails through a "white list" account (e.g. a gmail address)