SMTP Providers

SendGrail includes pre-configured templates for 17 popular SMTP providers plus a custom SMTP option. When you select a provider, the host, port, and encryption fields are automatically filled in. You only need to supply your credentials.

Provider Reference

Gmail

Setting	Value
Host	smtp.gmail.com
Port	587
Encryption	TLS
Username	Your full Gmail address
Password	App Password

WARNING

Gmail requires an App Password if two-factor authentication is enabled (which it should be). Generate one at myaccount.google.com/apppasswords. Your regular Google password will not work.

Gmail has a sending limit of 500 emails per day for personal accounts and 2,000 per day for Google Workspace accounts.

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Outlook / Microsoft 365

OAuth 2.0 only — Microsoft has phased out Basic Auth for SMTP across Microsoft 365. Setup uses an Azure AD app registration; see the Outlook / Microsoft 365 setup guide for the full flow.

Setting	Value
Auth	OAuth 2.0 (Microsoft Graph API)
Required	Azure AD app + Mail.Send permission

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SendGrid

Setting	Value
Host	smtp.sendgrid.net
Port	587
Encryption	TLS
Username	apikey (literal string)
Password	Your SendGrid API key

The username is always the literal text apikey -- do not enter your email address. Generate an API key from Settings > API Keys in the SendGrid dashboard. The key must have Mail Send permissions.

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Mailgun

Setting	Value
Host	smtp.mailgun.org
Port	587
Encryption	TLS
Username	SMTP username from Mailgun domain settings
Password	SMTP password from Mailgun domain settings

Find your SMTP credentials in the Mailgun dashboard under Sending > Domain settings > SMTP credentials. The username is typically in the format postmaster@your-domain.com. Do not use your Mailgun account password.

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Amazon SES

Setting	Value
Host	email-smtp.{region}.amazonaws.com
Port	587
Encryption	TLS
Username	SES SMTP username (from IAM credentials)
Password	SES SMTP password (from IAM credentials)

TIP

Replace {region} with your AWS region (e.g., us-east-1, eu-west-1). The host field is editable so you can specify the correct regional endpoint.

SES SMTP credentials are not the same as your AWS access keys. Generate them from the Amazon SES console > SMTP settings > Create SMTP credentials. Make sure your sending domain and email addresses are verified in SES.

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Postmark

Setting	Value
Host	smtp.postmarkapp.com
Port	587
Encryption	TLS
Username	Your Server API Token
Password	Your Server API Token

Postmark uses the same Server API Token for both the username and password fields. Find it in your Postmark server under Settings > API Tokens.

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Mandrill (Mailchimp Transactional)

Setting	Value
Host	smtp.mandrillapp.com
Port	587
Encryption	TLS
Username	Your Mailchimp email
Password	Your Mandrill API key

INFO

Mandrill is a paid add-on to Mailchimp. You must have an active Mailchimp account with the Transactional Email (Mandrill) add-on enabled. Generate an API key from the Mandrill dashboard under Settings > SMTP & API Info.

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Elastic Email

Setting	Value
Host	smtp.elasticemail.com
Port	2525
Encryption	TLS
Username	Your Elastic Email address
Password	Your SMTP password

Generate SMTP credentials from Settings > SMTP in the Elastic Email dashboard. Note the non-standard port 2525.

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SMTP2GO

Setting	Value
Host	mail.smtp2go.com
Port	2525
Encryption	TLS
Username	Your SMTP2GO username
Password	Your SMTP2GO password

Create SMTP credentials from the SMTP2GO dashboard under Settings > SMTP Users. Port 2525 is used by default to avoid ISP blocking of standard ports.

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Brevo (formerly Sendinblue)

Setting	Value
Host	smtp-relay.brevo.com
Port	587
Encryption	TLS
Username	Your Brevo account email
Password	Your SMTP key

Find your SMTP key in the Brevo dashboard under Settings > SMTP & API > SMTP. This is not your account password -- it is a separate SMTP-specific key.

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Netcore

Setting	Value
Host	smtp.netcorecloud.net
Port	587
Encryption	TLS
Username	Your Netcore SMTP username
Password	Your Netcore SMTP password

Find your SMTP credentials in the Netcore dashboard under Email API > SMTP settings.

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SparkPost

Setting	Value
Host	smtp.sparkpostmail.com
Port	587
Encryption	TLS
Username	SMTP_Injection (literal string)
Password	Your SparkPost API key

The username is always the literal text SMTP_Injection. Generate an API key from the SparkPost dashboard under Account > API Keys with Send via SMTP permission enabled.

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SendLayer

Setting	Value
Host	smtp.sendlayer.net
Port	587
Encryption	TLS
Username	Your SendLayer SMTP username
Password	Your SendLayer SMTP password

Find your SMTP credentials in the SendLayer dashboard under the SMTP credentials section after adding and verifying your domain.

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Mailjet

Setting	Value
Host	in-v3.mailjet.com
Port	587
Encryption	TLS
Username	Your Mailjet API key
Password	Your Mailjet Secret key

Mailjet uses your API key as the username and the paired Secret key as the password. Find both in the Mailjet dashboard under Account Settings > API Keys.

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Custom SMTP

Setting	Value
Host	Your SMTP server hostname
Port	Your SMTP server port
Encryption	None, SSL, or TLS
Username	Your SMTP username
Password	Your SMTP password

Use the Custom SMTP option to connect to any SMTP server not listed above. All fields are fully editable. Common port and encryption combinations:

Port	Encryption	Notes
25	None	Unencrypted, often blocked
465	SSL	Implicit TLS (legacy)
587	TLS	STARTTLS, recommended
2525	TLS	Alternative to avoid blocks

Quick Reference

Provider	Host	Port	Encryption
Gmail	smtp.gmail.com	587	TLS
Outlook / Microsoft 365	OAuth 2.0 (Microsoft Graph API)	—	—
SendGrid	smtp.sendgrid.net	587	TLS
Mailgun	smtp.mailgun.org	587	TLS
Amazon SES	email-smtp.{region}.amazonaws.com	587	TLS
Postmark	smtp.postmarkapp.com	587	TLS
Mandrill	smtp.mandrillapp.com	587	TLS
Elastic Email	smtp.elasticemail.com	2525	TLS
SMTP2GO	mail.smtp2go.com	2525	TLS
Brevo	smtp-relay.brevo.com	587	TLS
Netcore	smtp.netcorecloud.net	587	TLS
SparkPost	smtp.sparkpostmail.com	587	TLS
SendLayer	smtp.sendlayer.net	587	TLS
Mailjet	in-v3.mailjet.com	587	TLS