In-depth architectural comparison of the Agent Mail Gateway and Email Spam Tester MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.
At a Glance & Executive Verdict
Agent Mail Gateway
Communication · Remote HTTP/SSE
Quality: 55/100 (Good) | Auth: No auth required
Email Spam Tester
Communication · Remote HTTP/SSE
Quality: 82/100 (Excellent) | Auth: No auth required
Verdict Summary: Choose Agent Mail Gateway if you need specialized Communication tools running via a hosted cloud SSE transport. Choose Email Spam Tester if your workspace requires Communication integration with remote web transport. Both servers can be configured concurrently in your client's mcpServers manifest.
Which MCP Server Should You Choose?
A
Choose Agent Mail Gateway when:
You need dedicated capabilities in the Communication domain.
You prefer remote streaming HTTP/SSE transport architecture.
Your security boundary fits: No auth required (Free / Open Source).
You have access to required keys: AGENT_API_KEY, AGENT_MAIL_PASSWORD.
Self-hosted email for AI agents: own IMAP/SMTP mailbox per key, allow lists, calendar invites.
Email deliverability testing for agents. Four tools: get a disposable test address, wait for the report once the message arrives, read it, and fetch the raw source. The report has 42 checks (SPF, DKIM, DMARC, 21 blocklists, two spam engines, Gmail and Yahoo bulk sender rules), each linked to its RFC, plus a fix plan. Remote endpoint, no API key.
Category & Scope
Tools & Capabilities Breakdown
Agent Mail Gateway Tools (10)
get_mailbox_info
Own address, current date and time, allow lists, limits and the review rules/policies
list_messages
Received mail, newest first; filter by unread, or search by text, sender, subject, date
read_message
One message as Markdown, incl. attachments list and received invitations
get_attachment
Download an attachment
mark_message
Mark read/unread; move to Trash (if allowed)
send_message
Send a new email (Markdown, attachments)
Ready-to-Paste Client Configurations
Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).
Agent Mail Gateway is categorized under Communication and uses a remote streaming HTTP/SSE transport. In contrast, Email Spam Tester belongs to Communication using remote streaming HTTP/SSE transport. Select Agent Mail Gateway when you need capabilities focused on communication and Email Spam Tester when you require tools for communication.
Reply (or reply-all) in the thread; forward with attachments
create_event
Send, change and cancel invitations
list_events
Own events with attendee responses
respond_to_invitation
Accept, decline or tentatively accept a received invitation
Email Spam Tester Tools (4)
get_test_address
Reserve a single-use address to send a draft email to, for a full check.
Returns the address and the URL its report will appear at. The address
accepts exactly one message and expires after an hour. The email has to be
sent by the person, from the platform or mailbox they really send from:
half the checks read what that platform adds. The report covers 42 checks
(SPF, DKIM, DMARC, reverse DNS, TLS, blocklists, content, links, the
Gmail and Yahoo bulk-sender rules) and a plan of what to fix.
lang is decided now because the message arrives minutes later over SMTP,
which carries no hint of who is waiting for it. What wait_for_report
returns quotes check lines in English whatever it is set to; the person
following report_url sees their own language.
wait_for_report
Wait until the message arrives and has been analysed, then summarise it.
Call it after the email has been sent to the address from
get_test_address. Blocks rather than returning "not ready yet": an agent
told to poll writes a sleep loop and usually gives up before the analysis
finishes. Provider placement keeps filling in for up to 30 minutes after
the report; get_report reads the latest.
get_report
Read a report by its slug without waiting, with provider placement so far.
Works for one-hour tests and for letters in the person's series mailboxes.
get_message_source
The message exactly as it was received: headers, both bodies, source.
Useful when a finding points at a header and the agent needs to see what it
actually sent rather than what it believes it sent, or to find the
confirmation link in a welcome letter.