: Activation email from website could not be sent to Outlook.com accounts On my website, I send an automated email using libmail.php for new sign-ups. Users put in their email address and they

@Debbie626

Check your bounce-backs (via "view original"), serv mail queue, and mail delivery reports for 2 things:

First, AOL, Yahoo, Live, Hotmail, Outlook, and others will block mails without proper DKIM and/or SPF records. There will be a reply, but i dunno what error code they use. This is because a domain without those records can be more easily spoofed, so it's more or less mandatory to set one or both if you wanna send out mails. More about SPF here.

Second, ATT, sbcglobal, frontier, bellsouth, and others under ATT will block legit IP's all the time, even when they have DKIM and/or SPF. This usually returns a 521 error and some words about DNSBL:ATTRBL [failRBL]. Microsoft (hotmail, outlook, live) does this too occasionally, so make sure that you aren't getting some kinda RBL message back. If you don't see a bounce message back, check the serv side logs for clues. I dunno if this email is still valid, but MS can remove blocklist IP here: delist@messaging.microsoft.com. If you need the ATT realm one it's here: abuse_rbl@abuse-att.net.

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@Annie201

I agree with closetnoc as well that you should use mxtoolbox.com to check your domain name and IP address to see if you are listed on a blacklist and if you are, go through each entry and visit the respective websites to find out how to be taken off the blacklist.

This can happen because hackers may have installed a malicious script that is executed sometime when the main script (such as index.php) is run. The malicious script could then read an email address from a local database and send a special message to it. This then produces spam. I'm not sure how frequent the scripts are executed because I'm not a hacker myself, but that's about the gist of it.

Another thing to check for is outlook settings to see if your domain is blocked in the software itself. If you still have issues, then you may want to contact the microsoft team to rectify outlook problems.

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@Kaufman445

See closetnoc's comment for how to fix specific problem you are running into.

Generally, if you send emails with Mandrill or another similar site for programmatically sending emails you don't have to worry about keeping yourself off blacklists and other things like that as the email sending service will manage it for you.

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