I have trouble interpreting the email sending limits of Google Apps (for business account).
Messages per day: 2000
Clear, I send 2000 emails per day.
Recipients per message: 2000 (500 external)
Not so clear. I can send an email to 2000 recipients. So basically I could send 2000 emails to 2000x2000 recipients per day. Does external users mean our customers and partners?
Total recipients per day: 10,000
Whoa, so I can send emails to only 10,000 recipients, not to 2000x2000. So I can send at most 2000 emails a day, but to no more than 10,000 recipients. I understand that "Individual addresses count in every mail sent; 5 emails sent to 10 addresses count as 50 recipients". Are the total recipients internal or external recipients?
External recipients per day: 3,000
This clears it more. So I can send emails to 7,000 of my colleagues (???) per day and to 3,000 of my customers, partners etc. This is including individual addresses.
Unique recipients per day: 3000 (2000 external)
So e.g. I can send an email to 1000 customers and then send a follow-up email to 1000 of them (~2000 external recipients per day)
Recipients per message (sent via SMTP by POP or IMAP users): 99
I have no idea what this is. I am sending emails via PHP, not through GMAIL. Does the limit types above refer to emails sent from within GMAIL? Does that mean that if I have 100 registrants a day, only 99 of them will receive the welcome message because I send the emails by a script???