# MailCore/mailcore2

MailCore 2 provide a simple and asynchronous API to work with e-mail protocols IMAP, POP and SMTP. The API has been redesigned from ground up.

Repository: https://github.com/MailCore/mailcore2
Canonical: https://ross.abutalabs.com/products/mailcore2
Language: C++
License: NOASSERTION
License Family: other
Last push: 2026-07-29T08:30:29+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 95, release rhythm 8, longevity 100
- inputs: {"age_days": 4984, "days_push": 35, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2695, forks 649 (observed 2026-08-28T04:07:11.187623+00:00)

## What it is
MailCore 2 is a C++/Objective-C library providing a simple, asynchronous API for working with email protocols IMAP, POP, and SMTP. It includes an RFC822 parser/generator, HTML message rendering, and builds for iOS, macOS, Android, Windows, and Linux.

## Use cases
- fetch email headers and messages over IMAP asynchronously
- send email via SMTP from an iOS or Mac app
- parse and generate RFC822 email messages
- build a mail client UI with HTML message rendering
- access POP3 mailboxes from a mobile app
- integrate email sending/receiving into a cross-platform C++ app

## When to choose
- you need native IMAP/POP/SMTP support in an iOS, macOS, or Android app
- you want asynchronous email operations that don't block the main thread
- you need an RFC822 MIME parser and generator in C++ or Objective-C

## When to avoid
- you need a high-level managed email API in Python, Java, or JavaScript
- you only need to send transactional email via an HTTP API like SendGrid
- you need a full-featured mail client application rather than a library
- you require actively developed features, as the project is largely in maintenance mode

## Facets
- artifact type: library
- maturity: maintenance
- function: email, http-client, parser
- domain: email, developer-tools, cross-platform
- platform: windows, cpp
- tags: imap, smtp, pop3, rfc822, objective-c, async-api, mail-client-library, ios, macos, android, linux

## Member repositories
- MailCore/mailcore2 (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:11.187623+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:16:19.362465+00:00, confidence not recorded.
  - readme: https://github.com/MailCore/mailcore2 (fetched 2026-08-28T04:07:11.187623+00:00, sha 6733af9d5dad)
- Data as of 2026-08-30T08:39:29.467469+00:00.