Are we limited to Sending Emails via Javascript Remoting function call only for 4-5 records?

Question

I've implemented a JS Remoting function that accepts a Set of ID values as input. For all the ID values I loop around in code and use:

Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();

For each record I generate a PDF from a Visualforce page add it to the "mail" object record as:

Messaging.EmailFileAttachment fileAttachment = new Messaging.EmailFileAttachment();

at the end of the function. After I've looped around all records and generated a List<Messaging.SingleEmailMessage> messages I then use following code to send out emails in bulk Messaging.sendEmail( mailinglist )

The thing is, if I select 4-5 records, it works fine and sends out emails. But if I try to send out emails in acecss of 15-20, I get this error message:

error: SINGLE_EMAIL_LIMIT_EXCEEDED, Failed to send email: []

Now, this error is unique to cases when daily limit of sending emails has axceeded, right? i.e. around 1000 emails a day: Salesforce App Limit Cheatsheet

I want your expert opinions about if there is a limit on JS Remoting such that it will prevent sending emails like this?

I know that using Messaging.SingleEmailMessage, we can send 100 emails in single Messaging.sendEmail() function call.

Answer 1

In developer orgs, you are limited to send single emails to 15 email addresses (see footnote at the very bottom of the page). I think this means 15 unique email addresses, so you could send emails to the same email address multiple times, but not to more than 15 unique email addresses in one day. In prod and sandboxes, you can do 1000 emails.

Answer 2

There is a limit of 10 sendEmail methods per request. Sounds like you might have buffering enabled in your remoting call.

JavaScript remoting optimizes requests that are executed close to each other in time and groups the calls into a single request. This buffering improve the efficiency of the overall request-and-response cycle, but sometimes it’s useful to ensure all requests execute independently.

The default configuration is

{ buffer: true, escape: true, timeout: 30000 }

Try changing the buffer to be false

{ buffer: false, escape: true, timeout: 30000 }