Here’s an odd one that most likely isn’t an issue, but that folks should probably be aware of. We had an email recipient let us know that their “Unsubscribe” link was going to a creepy site that was trying to start a download. Upon clicking the link myself, it was indeed not the normal Unsubscribe page.
I was of course a little freaked out that we just unknowingly sent a phishing email to all of our subscribers! Luckily, digging through test emails, I couldn’t replicate the issue. Digging further, I discovered that the Unsubscribe link should have been: https://ctrk.klclick.com/xxxx. For this particular recipient, a period was removed: https://ctrkklclick.com/xxxxx. (Note: I went a little too far investigating this, but nothing was downloaded - still, click at your risk).
I have no clue when/where the period was removed; my guess is that it was on the recipient’s end. There were also no other links in the email effected (Klaviyo uses ctrk.klclick for all conversion tracking). But still wanted to put it out there as something to watch out for.