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SMTP servers

Choosing an SMTP server for bulk email

Ultra Email sends through an SMTP server you choose. You have two kinds of option, and many people use both.

1. Mailboxes you already have

Free to start, and fine for small lists. The limit is the provider's daily cap, not Ultra Email.

  • Gmail / Google Workspace

    Your own mailbox

    Good for:
    Small lists and getting started. You already have it and replies land in a normal inbox.
    Watch out for:
    Daily caps: roughly 500 recipients a day on personal Gmail and about 2,000 on Workspace. Google can pause an account that sends spam-like mail. You need an app password.

    Gmail / Google Workspace setup steps

  • Outlook.com and Microsoft 365

    Your own mailbox

    Good for:
    Businesses that already live in Microsoft 365.
    Watch out for:
    Microsoft is moving personal accounts away from password-based SMTP, and business admins must enable Authenticated SMTP. Limits are lower than a relay.

    Outlook.com and Microsoft 365 setup steps

  • Your domain mailbox (Hostinger, cPanel, GoDaddy)

    Your own mailbox

    Good for:
    Sending as you@yourbusiness.com with no extra service.
    Watch out for:
    Shared hosts usually allow only a few hundred emails an hour per mailbox, and some suspend accounts that exceed it. Check your plan's limit.

    Your domain mailbox (Hostinger, cPanel, GoDaddy) setup steps

2. Sending services (SMTP relays)

Built for volume, with delivery reports and domain authentication. You pay the provider, not us.

  • Amazon SES

    Sending service

    Good for:
    Large volumes at a low per-email cost, if you are comfortable in the AWS console.
    Watch out for:
    New accounts start in a sandbox until you request production access. You must verify your domain.

    Amazon SES setup stepsAmazon SES pricing on their site

  • SendGrid

    Sending service

    Good for:
    A well-known relay with good documentation and domain authentication tools.
    Watch out for:
    Free and entry plans have changed over the years; confirm the current limits before relying on them. The SMTP username is the word apikey.

    SendGrid setup stepsSendGrid pricing on their site

  • Brevo (Sendinblue)

    Sending service

    Good for:
    Small and medium senders who want a simple SMTP key and a dashboard of delivery events.
    Watch out for:
    Plans are limited by emails per day or month; check what your plan includes.

    Brevo (Sendinblue) setup stepsBrevo (Sendinblue) pricing on their site

  • Mailgun

    Sending service

    Good for:
    Developers and teams that want per-domain credentials and EU region support.
    Watch out for:
    Needs a verified domain. Use the EU host if your account is in the EU region.

    Mailgun setup stepsMailgun pricing on their site

  • Mailjet

    Sending service

    Good for:
    Teams that want a European provider with a straightforward API key and secret.
    Watch out for:
    Sender addresses and domains must be validated before sending.

    Mailjet setup stepsMailjet pricing on their site

  • Postmark

    Sending service

    Good for:
    Transactional email such as receipts and password resets, with a strong reputation for delivery speed.
    Watch out for:
    Built mainly for transactional mail. Check its policy before sending marketing campaigns through it.

    Postmark setup stepsPostmark pricing on their site

  • SMTP2GO

    Sending service

    Good for:
    A simple relay when your host blocks outgoing SMTP ports.
    Watch out for:
    Verify your sender domain and keep to the plan's monthly allowance.

    SMTP2GO setup stepsSMTP2GO pricing on their site

  • turboSMTP

    Sending service

    Good for:
    A relay with a plain SMTP login, if you prefer an alternative to the names above.
    Watch out for:
    Ultra Email has no dedicated preset, so use Custom and enter the host, port and credentials from your turboSMTP dashboard.

    turboSMTP pricing on their site

We do not quote third-party prices or limits on this page because they change, and a wrong number would cost you money. Each pricing link goes to the provider's own page. Ultra Email is not affiliated with, paid by, or endorsed by any provider listed here, and we earn nothing if you sign up.

How to choose

  • Under a few hundred emails a day: your own Gmail or domain mailbox is usually enough. Add a second sender and let Ultra Email rotate between them.
  • Thousands per send: use a relay, on your own domain, with SPF, DKIM and DMARC set up. See the setup guides.
  • Either way: warm up slowly (20 to 50 emails a day, rising over two to four weeks), keep complaints low and only email people who opted in. Provider terms forbid unsolicited bulk mail, and so does our acceptable use policy.

Related guides and pages

Where to go next: guides, setup steps and the pages people read alongside this one.