內容簡介
Cybexsoft SMTP 外掛旨在改善 WordPress 郵件發送的可靠性，透過替換預設的 PHP mail() 函數，確保郵件不會因主機限制而無法送達。該外掛提供多種郵件發送選項，並具備故障重試和診斷功能，提升郵件的送達率。
【主要功能】
• 支援多種郵件發送者設定
• 郵件發送失敗自動重試
• 詳細的連接追蹤與故障診斷
• 郵件日誌與 CSV 匯出功能
• SPF、DKIM 和 DMARC 記錄檢查
• 失敗警報通知功能
外掛標籤
開發者團隊
原文外掛簡介
WordPress sends mail with PHP’s mail() function by default, which many hosts throttle or block outright — so the message never arrives and nothing on the site says so.
This plugin replaces that transport and then keeps working after the swap, which is the part most setups leave out:
Several mailers at once, with roles. Add as many as you like and say which one sends. Pro adds a backup that takes over automatically when the primary starts refusing mail.
Nothing is silently lost. A send that fails is held and retried on a widening schedule instead of disappearing, and sending pauses while a mailer is plainly broken rather than throwing every message at it.
A connection trace, step by step. Watch the handshake with your mail server or API key and see exactly which step fails, instead of reading “could not send”.
Deliverability diagnostics that tell you what to publish. SPF, DKIM and DMARC checked against your sending domain, with the record found, what it means, and the exact change to make.
Free features
Mailers: generic SMTP, Amazon SES (via SMTP), SendGrid, Mailgun, Brevo, SMTP2GO, or default PHP mail — set up as many as you like and choose which one sends
Email log with search, status filter, and CSV export — kept indefinitely
Held mail: a message whose send fails is kept and retried on a widening schedule instead of being lost
Domain diagnostics: SPF, DKIM and DMARC record checks
Send test emails and trace the connection to your mailer step by step, with a rolling debug log for failures
Force-from controls so other plugins can’t silently change your From address
Allow & block lists: never email a blocked address or domain again
Failure alerts: an email to you once sending starts failing, at a threshold you set
Credentials encrypted at rest, or supplied from wp-config.php and kept out of the database entirely
Cybexsoft SMTP Pro is a companion plugin you install alongside this one. It adds its features to the same settings screen, so there is still only one place to configure anything. It is free during early access: ask us and we will email you the download and a license key. It adds:
Open & click tracking
Automatic blocking of addresses that keep bouncing, and an allow-list-only mode that stops a staging site emailing real customers
Backup mailer with automatic failover
Richer failure alerts: several recipients, your own counting window and quiet period, and no alarm for a message the backup mailer already rescued
Postmark, Resend, MailerSend, Mailjet, Elastic Email and Zoho ZeptoMail mailers, plus Gmail & Outlook over OAuth
Automatic log pruning on a retention window you set, plus a full content archive
Weekly deliverability reports
External services
This plugin can connect to the external services listed below. Sending email
necessarily involves handing your message to a mail provider, so the mailer
you choose is the main one — but the plugin only ever talks to the provider
you configured, using credentials you supplied. Everything else here is
optional and off until you act.
The mailer you configure
The plugin sends your outgoing WordPress email through whichever mailer you
select under Settings. Five of the free mailers are third-party services of
their own: four HTTP APIs and Amazon SES. In each case what is sent is the
outgoing message — recipients, subject, body, attachments and headers —
together with the credential you configured, and only while that mailer is the
selected one:
SendGrid — sent to https://api.sendgrid.com. Service provided by
Twilio SendGrid: terms of service,
privacy policy.
Mailgun — sent to your configured Mailgun API host. Service provided by
Mailgun: terms of service,
privacy policy.
Brevo — sent to https://api.brevo.com. Service provided by Brevo:
terms of service,
privacy policy.
SMTP2GO — sent to https://api.smtp2go.com. Service provided by
SMTP2GO: terms of service,
privacy policy.
Amazon SES — sent over SMTP to email-smtp.
the AWS region you select in the settings. What is sent is the outgoing
message, authenticated with the SES SMTP username and password you
configured, and only while Amazon SES is the selected mailer. Service
provided by Amazon Web Services:
service terms,
privacy notice.
The remaining free mailers — generic SMTP and PHP mail — connect to the mail
server you name in the settings, not to a service of ours. The Tools tab’s
connection trace opens a connection to that same server and stops before any
message is sent.
For SendGrid and Mailgun, that same connection trace instead checks your key
against the provider without sending any message: it requests
https://api.sendgrid.com/v3/scopes with your API key, or
https://api.mailgun.net (or api.eu.mailgun.net on the EU region) with your
API key and the sending domain you configured. It runs only when you click it,
and nothing else about your site is sent.
Cybexsoft licence server
Used only once you have entered a Pro licence key under Cybexsoft SMTP → License.
Your licence key, your site’s home URL, and the product and version being
licensed are sent to https://cybexsoft.com/api/licenses/verify when a key is
activated and periodically thereafter to confirm it is still valid, and to
https://cybexsoft.com/api/licenses/deactivate when a key is removed. Nothing
is sent while no licence key is stored, and the free plugin never contacts
these addresses at all — they are used only by the Pro add-on.
Service provided by Cybexsoft: terms of service,
privacy policy.
“Get Pro for Free” request form
Used only if you open that form and submit it.
The name, email address, website and message you type, are emailed to
[email protected] so we can send you the Pro download and a licence key. The
request is sent through this plugin’s own mailer — it is an ordinary email,
not a background call — and if your site cannot send mail yet, the form offers
to open the same request in your own email application instead.
Deactivation feedback
Used only if you choose a reason in the dialog shown when you deactivate the
plugin. The dialog can be skipped, and skipping it sends nothing; deactivation
proceeds either way.
If you do submit a reason, your site’s URL, the plugin version and build, the
mailer you had configured, the reason you picked and any note you wrote are
emailed to [email protected].
showdns.net
The Deliverability tab links out to https://showdns.net, which runs the same
SPF, DKIM and DMARC checks from outside your server. The plugin makes no
request to it — nothing is sent unless you click the link, at which point your
browser visits it like any other site and the domain being checked appears in
the URL.
Service provided by Cybexsoft: privacy policy.
