Apex read big mail

I think you meant to say "Apex read big mail"!

Apex is a programming language used for building custom applications on the Salesforce platform. If you're trying to read big mail, I'm assuming you're referring to a large volume of emails or a big email campaign.

Here are a few possible ways to read big mail in Apex:

1. Using the Messaging class: You can use the Messaging class to read emails sent to a specific email address or a set of email addresses. You can use the getAttachments() method to retrieve attachments and the getBody() method to retrieve the email body.
2. Using the Email class: You can use the Email class to read emails sent to a specific email address or a set of email addresses. You can use the getAttachments() method to retrieve attachments and the getBody() method to retrieve the email body.
3. Using a third-party library: There are several third-party libraries available that provide additional functionality for reading and processing emails in Apex, such as the ApexEmail library.

Here's an example of how you might use the Messaging class to read big mail in Apex:

Messaging.Message[] messages = [SELECT Id, Subject, Body, Attachments FROM Messaging.Message WHERE Recipient = :yourEmail];
for (Messaging.Message message : messages) {
    // Process the email
    System.debug(message.Subject + ': ' + message.Body);
    for (Messaging.Attachment attachment : message.Attachments) {
        // Process the attachment
        System.debug(attachment.Name + ': ' + attachment.Body);
    }
}

Note that this is just a simple example, and you may need to modify it to fit your specific use case. Additionally, be aware of any limitations or restrictions on reading and processing emails in Apex, such as the maximum number of emails that can be retrieved at once.