Email addresses: Are they case sensitive?

[BDIMarketing]

We have received complaints from a few recipients about not getting their emails. It happens that they capitalize the first initials of their email addresses. Will that prevent them from receiving the emails address to them? I also tried editing the contact information, but when saving the changes, the entire email address is automatically reverted to the lower-case format. I will appreciate your help. Best regards, Myriam Ananias

[William_A · Accepted solution]

Hello @BDIMarketing ,

Email addresses aren't case sensitive when it comes to capitalization, which is the standard across all email programs, domain hosts, and service providers. 

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If you're having delivery issues for those contacts, I'd recommend checking out some general best practices for delivery.

Delivery can have a lot of variables, from elements on our side, on your side, on the recipient's side, and in their email system company's side. It's typically best to set up additional authentication for your emails, particularly self-authentication since you have your own domain.

If you'd like to learn more about safelisting, and what it entails:

Safelisting domains in a security system

Safelisting email addresses in an email client or security system

If you're wanting more in-depth, specialized insight on your current deliverability, it'd be worth speaking with one of our Delivery agents.