Outgoing mail blocked

Dear Zoho,

I would be grateful if you could unblock our outgoing mail (nexxit@zoho.com)

I tried sending our company's usual wishes and calendar attachment, but as usual emails got bounced, and now our outgoing mail is blocked. Many customers changed their email or their accounts (especially @hotmail) got hacked or receive too many spam thus they deactivated it. Our company cannot find this out until we try to send a new message.

I couldn't use Zoho campaigns either because I need to attach some files (a calendar in .pdf format) to the email.

It would be practical to raise the limit to something like 50 or 100.

Please help,

Shu'ayb
(Nexxit)