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  • Customer Success

Case Study: Helping NHS Providers

The National Health Service (NHS) is one of the most cherished and respected institutions in the UK. It provides free health care to millions of people every day and employs almost two million staff across various sectors and roles. So, who are NHS Providers? NHS Providers – one of our valued customers – is the […]

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email delivery errors: what do they mean?
  • Email Delivery & Tips

Email Delivery Errors and SMTP Codes: What They Mean and How to Fix Them

You hit send. The recipient never gets it. Back comes a wall of text with something like 550 5.7.26 buried in it, and now you have to figure out which part to actually read. Most pages on this topic give you a flat list of errors and a vague “check your DNS.” That’s not enough […]

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  • Email Delivery & Tips

Reaching Donors’ Inboxes: A 2026 Guide to Nonprofit Email Deliverability

Email remains one of the most effective tools nonprofits have for engaging supporters, driving donations and nurturing long-term relationships. Even as new channels emerge, well-crafted email campaigns continue to outperform many other outreach methods by both reach and return on investment. Why Email Still Matters for Nonprofits Email is not just alive. It’s thriving in […]

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  • Features & Updates

Microsoft 365 SMTP AUTH Basic Authentication Ending: Current Timeline, Impact, and Migration Guide

Microsoft is retiring Basic Authentication for SMTP AUTH Client Submission in Exchange Online. If your printers, scanners, scripts, or legacy applications send email through Microsoft 365 using username and password authentication, they need a new solution before Basic Auth is permanently removed. Here’s everything you need to know about the timeline, impact, and your options […]

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  • Email Delivery & Tips

Out of Office Message Examples: 22 Copy-Paste Templates for Every Scenario

You came here for templates. They’re below. But first, the safest default for most people: Subject: Out of office until [return date] Hi, Thanks for your email. I’m out of the office from [start date] and back on [return date]. I’ll reply when I return. For anything urgent before then, please contact [colleague’s name] at […]

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  • Email Delivery & Tips

Hard Bounce vs Soft Bounce: What They Mean and How to Fix Them

You sent the email. The recipient never got it. Now your dashboard says “hard bounce” or “soft bounce” or, if you’re an SMTP2GO user, possibly “rejected.” Three different statuses, three different causes, three different things you should do about them. Here’s the short version, then the long one. Quick Answer Hard bounce: the email failed […]

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