Best SMTP Services for Microsoft 365

Find and compare the best SMTP services for Microsoft 365 in 2025

Use the comparison tool below to compare the top SMTP services for Microsoft 365 on the market. You can filter results by user reviews, pricing, features, platform, region, support options, integrations, and more.

  • 1
    OutboundSMTP Reviews

    OutboundSMTP

    OutboundSMTP

    $4 per 2,500 messages
    Implementing DKIM signing enhances the likelihood of your emails landing in the inboxes of providers such as Gmail and Office365. With multiple servers based in the USA and Europe, our service ensures enhanced reliability. Say goodbye to the stress of overseeing your own email server and managing its IP reputation. You can effortlessly create SPF and DKIM records for your domains, even without any prior experience. In the event of IP blacklisting, our SMTP relay service can effectively address your reputation issues. We offer round-the-clock technical support through phone, chat, or email, committed to guaranteeing the successful delivery of your emails. This means you will be able to consistently deliver your messages straight to the inbox. Our team meticulously optimizes sending routes while keeping a close eye on our IP reputations to provide you with the highest quality service. We uphold a Zero Spam Policy that enables us to block or limit messages that could jeopardize our reliability or your reputation. Additionally, once your domain ownership is verified through DNS, you can send emails from an unlimited number of "From" addresses or domains, giving you the flexibility needed for your communication needs. This comprehensive approach not only simplifies the email sending process but also enhances your overall email strategy.
  • 2
    WP Mail SMTP Reviews

    WP Mail SMTP

    WP Mail SMTP

    $49 per year
    If you're struggling with WordPress emails not being delivered, you're certainly not the only one facing this challenge. The increasing prevalence of stringent spam filters makes it difficult for emails to reach their intended recipients unless they're set up properly. By transitioning from the standard WordPress email configuration to WP Mail SMTP, you can effectively eliminate your email delivery problems once and for all. Are you potentially losing out on valuable leads and sales due to your WordPress site's messages landing in spam folders? Such losses can significantly impact your revenue. When your emails are authenticated through SMTP, they are more likely to be viewed as legitimate, allowing them to bypass those strict spam filters. WP Mail SMTP is compatible with leading secure SMTP providers, ensuring that regardless of your email volume needs, you can partner with the ideal provider that fits your business requirements and financial plan. This way, you can ensure consistent communication with your audience and maximize your conversion opportunities.
  • 3
    DuoCircle Reviews
    Dependable and safe email hosting solutions for both small to medium-sized businesses and large enterprises. We manage the secure processing of over 100 million emails each month for our clients. Our services include enhanced gateway security, robust filtering systems, inbound email protection, email service backups, and outbound SMTP, all built on a cutting-edge infrastructure to deliver the high-quality results our clients expect. Our offerings encompass a secure email gateway, backup MX services, email forwarding, outbound SMTP, and various additional features. DuoCircle provides robust protection against phishing attempts through its Link Click Protection, which is integrated into the Advanced Threat Defense Suite. This feature ensures that even if the content of a website changes between clicks, you remain protected from potential threats. With Link Click Protection, your sensitive corporate information is safeguarded, as employees are blocked from accessing sites that could exploit such data. Additionally, you receive immediate alerts when a suspicious link is about to be clicked, ensuring your security remains a top priority. Overall, our comprehensive email security solutions enhance the safety of your communications and provide peace of mind for your organization.
  • 4
    Postmastery Reviews
    Postmastery delivers a comprehensive platform for professional email monitoring that extends well beyond mere ‘click & open’ metrics. Its Delivery Analytics system analyzes SMTP delivery information from both local mail servers and SMTP service providers, incorporating data from Microsoft SNDS, Return Path Sender Score, along with various blacklists. Users are equipped with real-time dashboards and benefit from automatic notifications. Issues like high bounce rates, prolonged delivery times, landing in junk folders, or being blacklisted can severely hinder email marketing efforts and adversely affect your company's reputation. To proactively manage these challenges, Postmastery establishes a benchmark for improvement and conducts thorough email delivery evaluations. Additionally, should the situation require it, our team offers direct support at the infrastructure level. By turning to Postmastery for your delivery monitoring needs, you can concentrate on your primary business operations while leveraging our extensive email delivery expertise, tools, and resources available through our 'email delivery control centre.' This partnership ensures that your email campaigns are not just effective but also aligned with best practices in the industry.
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