Mailler def

I think you meant "mailer"!

A mailer is a software application or service that sends emails on behalf of a user or organization. Mailers can be used for various purposes, such as:

1. Sending newsletters or promotional emails to a large number of recipients.
2. Automating email marketing campaigns.
3. Sending transactional emails, such as order confirmations or password reset emails.
4. Providing a way for users to send emails from a custom domain or email address.

Some common types of mailers include:

1. Email service providers (ESPs): Companies like Mailchimp, Constant Contact, and Campaign Monitor offer mailer services that allow users to send emails to their subscribers.
2. Email clients: Email clients like Microsoft Outlook, Mozilla Thunderbird, and Apple Mail allow users to send emails using their own email accounts.
3. SMTP servers: SMTP (Simple Mail Transfer Protocol) servers are used to send emails between mail servers. Mailers can use SMTP servers to send emails on behalf of a user or organization.
4. API-based mailers: Some mailers provide APIs (Application Programming Interfaces) that allow developers to integrate email sending capabilities into their applications.

When choosing a mailer, consider factors such as:

1. Sending limits: Check the maximum number of emails you can send per day or per hour.
2. Email authentication: Look for mailers that support email authentication protocols like SPF, DKIM, and DMARC to help prevent spam and improve deliverability.
3. Customization: Choose a mailer that allows you to customize your emails with your own branding and content.
4. Integration: Consider a mailer that integrates with your existing applications or platforms.
5. Cost: Mailers can vary in cost, depending on the number of emails you send and the features you need.