Mailosaur Ltd Mailosaur logo
Inboxes (servers)
Create an inbox
SMTP, POP3, IMAP
Manage access
Forwarding rules
Delete an inbox
Inbox settings
Email testing
Sending test email to Mailosaur
Forward email
Reply to email
Send to an external address
Testing with POP3
Testing with SMTP
Email Previews
SMS testing
Phone numbers
Reply to SMS
Authenticator (TOTP)
Managing devices
Automating TOTP tests
Integrate & automate
Selenium
Quickstart
Email testing
SMS testing
Playwright
Quickstart
Email testing
SMS testing
Cypress
Quickstart
Email testing
SMS testing
SDKs
Node.js
Java
Ruby
Python
.NET
PHP
Go
JavaScript (in browser)
Common assertions
HTML content
Plain text content
Links
Codes
Attachments
Images
Message properties
Spam
Cucumber
Quickstart
Email testing
SMS testing
Robot Framework
WebdriverIO
Ghost Inspector
Postman
Insomnia
PowerShell
TestCafe
Account Management
API keys
External domains
External email addresses
IP addresses and ports
Managing users
Deleting your account
Single sign-on (SSO)
SCIM
SSO/SCIM using Okta
SSO/SCIM using Microsoft Entra
API Reference
Mailosaur LtdMailosaur logo
Mailosaur Ltd Mailosaur logo
Inboxes (servers)
Create an inbox
SMTP, POP3, IMAP
Manage access
Forwarding rules
Delete an inbox
Inbox settings
Email testing
Sending test email to Mailosaur
Forward email
Reply to email
Send to an external address
Testing with POP3
Testing with SMTP
Email Previews
SMS testing
Phone numbers
Reply to SMS
Authenticator (TOTP)
Managing devices
Automating TOTP tests
Integrate & automate
Selenium
Quickstart
Email testing
SMS testing
Playwright
Quickstart
Email testing
SMS testing
Cypress
Quickstart
Email testing
SMS testing
SDKs
Node.js
Java
Ruby
Python
.NET
PHP
Go
JavaScript (in browser)
Common assertions
HTML content
Plain text content
Links
Codes
Attachments
Images
Message properties
Spam
Cucumber
Quickstart
Email testing
SMS testing
Robot Framework
WebdriverIO
Ghost Inspector
Postman
Insomnia
PowerShell
TestCafe
Account Management
API keys
External domains
External email addresses
IP addresses and ports
Managing users
Deleting your account
Single sign-on (SSO)
SCIM
SSO/SCIM using Okta
SSO/SCIM using Microsoft Entra
API Reference
AutomationCommon assertions

Common assertions

Learn how to automate common assertions when testing email and SMS with Mailosaur.

HTML content

This guide shows how easy it is to extract and test HTML and text content within emails using Mailosaur.

Plain text content

This guide shows how easy it is to automate the testing of the contents of an email or SMS message using the Mailosaur API.

Links

This guide shows how easy it is to test links and hyperlinks from the content on your emails or messages to test they work correctly.

Codes

This guide shows how easy it is to automatically extract verification and offer codes from the content of email or SMS messages.

Attachments

This guide shows how easy it is to test email attachments and properties like name, content type, size, images, and fetching attachments in various languages.

Images

This guide shows how easy it is to test images, including web beacons, within a HTML email using Mailosaur.

Message properties

This guide shows how easy it is to test the common properties of an email or SMS message including subject line, recipients, senders and email headers.

Spam

This guide shows how easy it is to test your email spam score with Mailosaur's deliverability report and SpamAssassin checks.

Previous

Frameworks and tools

Next

HTML content of an email

Subscribe to our newsletter

Receive tips, ideas, and best practices from our testing and engineering experts.

Mailosaur logo
ProductsEmail TestingEmail PreviewsSMS Testing
SupportPricingDocumentationTrust CenterAPI Status
CompanyBlogCustomersContact UsSecurityFAQs
LegalCustomer TermsUser TermsPrivacy

© 2026 Mailosaur Ltd. All Rights Reserved.Mailosaur Ltd is registered with Companies House (no. 07999725) at The Square, Basing View, Basingstoke, Hampshire RG21 4EB, United Kingdom.