https://mailok.io/blog Practical notes on email verification, deliverability and list hygiene, from the team that runs MailOK. en https://mailok.io/blog/spreadsheet-in-spreadsheet-out https://mailok.io/blog/spreadsheet-in-spreadsheet-out Wed, 29 Jul 2026 00:00:00 GMT A simple export makes it easier to return each result to the right contact without exposing your whole CRM. https://mailok.io/blog/the-api-now-belongs-to-your-account https://mailok.io/blog/the-api-now-belongs-to-your-account Tue, 23 Jun 2026 00:00:00 GMT Plan for unresolved checks, failed requests and changing addresses before putting verification into production. https://mailok.io/blog/rebuilding-the-batch-engine https://mailok.io/blog/rebuilding-the-batch-engine Fri, 22 May 2026 00:00:00 GMT A verification job can slow down near the end because some receiving servers need more time or give no clear answer. https://mailok.io/blog/what-we-store https://mailok.io/blog/what-we-store Tue, 07 Apr 2026 00:00:00 GMT Send only what the check needs, and get specific answers about retention, deletion and reuse. https://mailok.io/blog/what-we-will-not-build https://mailok.io/blog/what-we-will-not-build Mon, 16 Feb 2026 00:00:00 GMT A plausible naming pattern and a positive server response do not establish who will receive your message. https://mailok.io/blog/deliverability-beyond-the-list https://mailok.io/blog/deliverability-beyond-the-list Fri, 05 Dec 2025 00:00:00 GMT Check authentication, recipient expectations and delivery reports before paying to clean the list again. https://mailok.io/blog/email-list-decay https://mailok.io/blog/email-list-decay Tue, 04 Nov 2025 00:00:00 GMT A dormant list needs a review of addresses, subscription history and whether the message still makes sense. https://mailok.io/blog/email-typos-at-signup https://mailok.io/blog/email-typos-at-signup Thu, 09 Oct 2025 00:00:00 GMT A useful suggestion can save a signup. An automatic correction can send mail to the wrong person. https://mailok.io/blog/one-year-of-mailok https://mailok.io/blog/one-year-of-mailok Fri, 19 Sep 2025 00:00:00 GMT Open tracking can mislead you. Review other activity before deciding a subscriber has gone quiet. https://mailok.io/blog/spam-traps https://mailok.io/blog/spam-traps Tue, 26 Aug 2025 00:00:00 GMT Why verification cannot certify a list as trap-free, and what to change when trap problems appear. https://mailok.io/blog/disposable-email-addresses https://mailok.io/blog/disposable-email-addresses Mon, 28 Jul 2025 00:00:00 GMT Decide based on what the account needs, and distinguish temporary inboxes from lasting privacy aliases. https://mailok.io/blog/smtp-verification-explained https://mailok.io/blog/smtp-verification-explained Wed, 18 Jun 2025 00:00:00 GMT A server response provides evidence about delivery, but it cannot confirm everything about a mailbox. https://mailok.io/blog/verify-email-at-signup https://mailok.io/blog/verify-email-at-signup Fri, 16 May 2025 00:00:00 GMT Catch obvious mistakes at signup, allow for inconclusive checks, and confirm inbox access separately. https://mailok.io/blog/role-email-addresses https://mailok.io/blog/role-email-addresses Thu, 10 Apr 2025 00:00:00 GMT A role address describes a purpose. It does not, by itself, tell you to remove the contact. https://mailok.io/blog/catch-all-email-addresses https://mailok.io/blog/catch-all-email-addresses Mon, 03 Mar 2025 00:00:00 GMT The server accepts the address. That still may not tell you whether the intended mailbox exists. https://mailok.io/blog/clean-email-list https://mailok.io/blog/clean-email-list Fri, 31 Jan 2025 00:00:00 GMT Check its source, preserve exclusions, verify the addresses, and put the results back where they will be used. https://mailok.io/blog/email-bounce-rate https://mailok.io/blog/email-bounce-rate Tue, 17 Dec 2024 00:00:00 GMT A bad address, a temporary delay and a policy block need different fixes. https://mailok.io/blog/why-unknown-is-free https://mailok.io/blog/why-unknown-is-free Thu, 07 Nov 2024 00:00:00 GMT An unresolved check should remain unresolved, and MailOK does not charge for that result. https://mailok.io/blog/email-verification-statuses https://mailok.io/blog/email-verification-statuses Wed, 16 Oct 2024 00:00:00 GMT Read verification results as evidence about an address, with the reason and check date attached. https://mailok.io/blog/mailok-launch https://mailok.io/blog/mailok-launch Fri, 20 Sep 2024 00:00:00 GMT Check a contact list before a send, or check new addresses as they enter your product.