I bought sendfox in Dec 2024 for project I launched in Feb 2025.
And found it utterly useless.
The UI is clunky and hard to figure out what goes where, this is coming from a life long IT guy.
Some features only work if you do it a specific way.

I gave up on it with my 1st project and only tried it again with a new project and wow 5 mins in I'm red with frustration again.
I'm trying to send a 1st contact email to supplier with publicly listed emails.
The plan with using sendfox for this is I can track if it was read and delivered in one place and use the buildt in landing page function.
It listed my email as "optimized" but all seemed fine. Only once I started digging found out that none of the emails were sent. They are afraid I'm spamming someone... Ok but will that not be a "me" problem. If I'm stupid enough to spam I will damage my own domain record and not affect sendfox...... or is this because they still put their branding on my fully paid software and I need an additional subscription to get rid of it.

I got sold on appsumo and send fox after buying Noah's book Million dollar weekend.
Sadly only thing I got for this is a appsumo add at the start of every youtube video for 5 months. Seems like Appsumo pushes out apps as quick as possible to make a quick buck and does not matter it is works or not.
Hey I guess you can do that with life time licenses, only companies that charge subscriptions have to be concerned with their apps being and staying useful to clients.

What a scam.