We have an invite system. It goes through Sendgrid, and it sends out a personalized email. So far no issues sending email to every domain name and email cliente except hotmail and outlook (I know, who uses hotmail these days!).
From my limited experience, Hotmail and Outlook love blacklisting IPs. If you are on Basic/Essentials plan on Sendgrid, your emails get sent from the same IP as potentially hundreds of other sites… If one of those sends bad emails and gets blacklisted, it affects everyone at once on that IP.
If I were in your shoes, I’d evaluate getting a dedicated IP with Sendgrid - Which unfortunately requires a Pro plan…
I’m sure others will have other possible explanations. Just my 2 cents.
This is very interesting, and it makes sense. I’m on the essentials plan, so moving to a pro plan is a 3x price jump, but might be worth testing. I’ve contacted Sendgrid, let’s see what they come up with.
Was having the same issue with a client’s app last week. Make sure you do everything you can to optimize for deliverability on Sendgrid’s end (domain validation, link branding, and reverse DNS). You can find this in Sendgrid under “Sender Authentication”.
We ended up upgrading to the pro plan and emails are coming through perfectly now.
Some of Sendgrids IP addresses for sending are blacklisted by those email providers. The unfortunate part is Sendgrid won’t move your account to a server with a good reputation unless you upgrade an account.
Personally I made the switch to Postmark and am loving it. They focus on deliverability and speed and have a dedicated bootstrapped team that provide great customer service.
Yup, on a paid SendGrid plan (lowest tier) but most mails do not reach yahoo, live, hotmail, or outlook (outright blocked or land in spam). Our emails are purely transactional. I’m looking into PostMark now.