go-gomail/gomail

★ 4,730GoAudience · developerComplexity · 2/5Setup · easy

Mindmap

mindmap
  root((Gomail))
    What it does
      Send emails via SMTP
      HTML and plain text
      File attachments
      Embedded images
    Features
      SSL TLS support
      Batch sending
      Custom senders
    Tech Stack
      Go
    Use Cases
      Transactional email
      Bulk email
      Third-party API routing

mindmap root((Gomail)) What it does Send emails via SMTP HTML and plain text File attachments Embedded images Features SSL TLS support Batch sending Custom senders Tech Stack Go Use Cases Transactional email Bulk email Third-party API routing

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Things people build with this

USE CASE 1

Send transactional emails, password resets, order confirmations, from a Go web app.

USE CASE 2

Attach files and embed images in HTML emails sent from a Go backend.

USE CASE 3

Send bulk emails efficiently by reusing a single SMTP connection instead of reconnecting for each message.

USE CASE 4

Plug in a custom sender to route emails through a third-party email API or local mail server.

Tech stack

Getting it running

Difficulty · easy Time to first run · 30min

No external dependencies from Go 1.5+, only needs an SMTP server or API credentials.

In plain English

Gomail is a Go library that lets developers send emails from their applications. It connects to an SMTP server, which is the standard protocol most email providers use to receive outgoing mail, and handles the actual delivery from there. The project promises stable versions, meaning code you write against it today will not break when the library is updated. The library covers the most common email needs: plain text and HTML message bodies, file attachments, images embedded directly in the email, secure connections over SSL and TLS, and correct handling of special characters so messages arrive without garbled text. It can also reuse a single SMTP connection to send a batch of messages, which is faster and less wasteful than opening a new connection for every email. For cases where SMTP is not the right fit, such as sending through a local mail server or a third-party email API, the library is designed to accept custom sending methods. That flexibility means it can fit into many different server setups without forcing a specific infrastructure choice. The README is short and direct. It points to external documentation for full usage examples and covers one common error people encounter: a security certificate warning that can appear when the SMTP server uses a certificate not recognized by the system. The workaround shown in the docs disables certificate checking, and the README explicitly warns that this approach is not safe for production use. The project requires Go version 1.2 or newer. From Go 1.5 onward, it has no external package dependencies, so adding it to a project does not pull in additional third-party code.

Copy-paste prompts

Prompt 1

Using the gomail Go library, show me how to send an HTML email with a file attachment via Gmail's SMTP server.

Prompt 2

How do I send multiple emails in one SMTP session with gomail to avoid reconnecting for each message?

Prompt 3

I need to send email via a third-party API instead of SMTP. How do I create a custom Sender with gomail?

Prompt 4

My gomail app shows a certificate error when connecting to the SMTP server. How do I fix it safely in production?

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