Warm-up, authentication, bulk sender rules and the metrics that decide whether your own campaigns reach the inbox.
Email warm-up is the practice of increasing sending volume from a new mailbox or domain gradually, so mailbox providers can build a picture of it before it sends larger volumes. Good warm-up relies on real, low-volume, wanted mail and steady growth, not on tricks. The extension's optional WarmTalk feature helps by running a paced conversation loop between two mailboxes you own.
7 min readSPF, DKIM and DMARC are DNS-based standards that let receiving mail servers check that email claiming to come from your domain is authorised. SPF lists which servers may send for you, DKIM adds a cryptographic signature, and DMARC tells receivers what to do when checks fail and where to send reports. Gmail and Yahoo now require authentication from senders, so this is a baseline, not an optional extra.
8 min readSince February 2024, Gmail and Yahoo have required senders to authenticate their mail, and bulk senders must also publish DMARC, support one-click unsubscribe and keep spam complaint rates low. Google describes bulk senders as those sending close to 5,000 or more messages a day to Gmail addresses. Google also advises keeping the reported spam rate below 0.1 percent and never reaching 0.3 percent.
7 min readEmails usually go to spam because the receiving provider does not trust the sender enough: authentication is missing or misaligned, the list includes people who did not ask for the mail, recipients complain or ignore it, or the domain is new and sending too much too fast. The durable fix is to address those causes directly, not to disguise the mail.
7 min readThe deliverability metrics that matter most are bounce rate, spam complaint rate, inbox placement, authentication pass rate and genuine engagement such as replies and clicks. Delivery rate alone only tells you that a server accepted the message, not whether it reached the inbox. Tracking these together shows how mailbox providers see your sending.
6 min readPlan a gradual daily sending ramp for a new mailbox or domain.
Open free toolCheck a subject line and body for spammy phrasing, shouting and link overload.
Open free toolBuild SPF and DMARC DNS TXT records for your sending domain.
Open free toolSee how a subject and preheader truncate on mobile and desktop inboxes.
Open free toolRuns in the Gmail, Outlook, Yahoo, AOL and Proton tabs you are already signed in to. Filter by sender or campaign, set reading times and limits, keep a local activity log. No mailbox passwords, one-time licence.