I have a PayPal account that I use very occasionally to make purchases (I will refrain from using PayPal for anything else). I decided to change my PayPal email to a SimpleLogin alias using one of my own domains. PayPal accepted my email without issue (to date, Steam is the only entity which refused to accept an alias). However, the confirmation email it sent me had a minor flaw. There was no link for me to confirm the email. After staring at it in confusion for two minutes, I requested a new email. The second confirmation came with the link. Second time is the charm I suppose.