The Fastmail SMTP, IMAP and POP3 settings you need — server smtp.fastmail.com, port 587 (STARTTLS) or 465 (SSL/TLS). Copy each field with one click. Free, with no signup.
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Fastmail mail settings
Outgoing mail (SMTP)
SMTP server
smtp.fastmail.com
Port — STARTTLS
587
Port — SSL/TLS
465
Security
SSL/TLS on 465 (recommended) or STARTTLS on 587.
Incoming mail (IMAP)
IMAP server
imap.fastmail.com
Port — SSL/TLS
993
Port — STARTTLS
143
Incoming mail (POP3)
POP3 server
pop.fastmail.com
Port — SSL/TLS
995
Port — STARTTLS
110
Sending limits & login
Daily send limit
Generous per-plan limits aimed at personal and small-business use.
Authentication
Requires an app password — your login password will not work in mail clients.
App password
Create one at Settings > Privacy & Security > App passwords.
Fastmail requires an app password for every third-party SMTP, IMAP or POP connection.
Sending cold email? EmailChaser manages inboxes, warmup and deliverability for you.
Try EmailChaser freeFind the SMTP, IMAP and POP3 server settings for any email provider. Free, with no signup — every field copies with one click.
To send email through Fastmail, set your outgoing (SMTP) server to smtp.fastmail.com and use port 587 (STARTTLS) or 465 (SSL/TLS). SSL/TLS on 465 (recommended) or STARTTLS on 587.
For incoming mail, use the IMAP server imap.fastmail.com on port 993, or POP3 at pop.fastmail.com on port 995. Pick the exact values from the tool above and copy them straight into your mail client.
Generous per-plan limits aimed at personal and small-business use. Requires an app password — your login password will not work in mail clients. Create one at Settings > Privacy & Security > App passwords.
Those caps make single-mailbox sending fine for personal mail but a poor fit for cold outreach at volume. Emailchaser spreads sending across warmed inboxes and manages deliverability, so you can scale without burning Fastmail accounts.
What are Fastmail's SMTP settings?
Fastmail's outgoing (SMTP) server is smtp.fastmail.com. Use port 587 (STARTTLS) or 465 (SSL/TLS). SSL/TLS on 465 (recommended) or STARTTLS on 587. Sign in with your full email address and password (or app password).
What is Fastmail's IMAP or POP3 server?
Fastmail's incoming IMAP server is imap.fastmail.com on port 993 (SSL/TLS). If you prefer POP3, use pop.fastmail.com on port 995.
Which port should I use for Fastmail?
Use port 587 with STARTTLS wherever it's offered — it's the modern standard for authenticated sending. Port 465 with SSL/TLS is a solid alternative. Avoid port 25, which most networks block for client sending. Fastmail's recommended value is above.
Why won't my Fastmail SMTP connection work?
Check authentication first: Requires an app password — your login password will not work in mail clients. Create one at Settings > Privacy & Security > App passwords. Then confirm the host, port and security method match exactly — a 587/SSL or 465/STARTTLS mismatch will fail to connect.
Can I send bulk or cold email through Fastmail?
Not at scale. Generous per-plan limits aimed at personal and small-business use. Providers throttle bursts to fight spam, so pushing cold email through one mailbox hits limits and wrecks deliverability. High-volume outreach belongs on dedicated infrastructure that spreads sending across warmed inboxes — which is what Emailchaser does.
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