Sending emails using Gmail in C#

Gmail SMTP can be used to send emails from C# applications by combining .NET with the MailKit and MimeKit libraries, configuring Gmail’s server settings, authenticating, and creating MIME messages with recipients, subjects, HTML or plain-text bodies, CC/BCC fields, and file attachments. Gmail imposes constraints including daily sending quotas, message-size limits, automated spam and content filtering, and authentication requirements that may involve OAuth 2.0 or app passwords for accounts using two-factor authentication; the source also notes security risks associated with hardcoded credentials and legacy basic-authentication settings. For higher-volume or more delivery-focused use cases, it presents Mailtrap Email Sending as an alternative SMTP or API-based provider with monitoring, analytics, delivery logs, and domain verification. It also emphasizes testing messages before production delivery to assess rendering across clients and devices, HTML/CSS compatibility, spam scores, blacklisting, headers, and SMTP transaction details, describing Mailtrap Email Testing’s virtual inboxes as a controlled environment for these checks.

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