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Where did you post the link such that you were getting people to sign up on your landing page?

I post it here, reddit, quora and warriorforum.

You should try betali.st as well

Yes, I submit a few weeks ago the site, is pending to approval. I think I should pay for the approval and see how things go.

I paid to expedite ($79 or so) and it was worth it. Also did startuplister for $25 and got a total of 450 sign ups for MorphMail.

Thanks for sharing this information , it looks that sites like Betalist are the best choice for my app right now.