log4j-core/src/main/java/org/apache/logging/log4j/core/net/SmtpManager.java [133:157]:
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    public void sendEvents(final Layout<?> layout, final LogEvent appendEvent) {
        if (message == null) {
            connect(appendEvent);
        }
        try {
            final LogEvent[] priorEvents = removeAllBufferedEvents();
            // LOG4J-310: log appendEvent even if priorEvents is empty

            final byte[] rawBytes = formatContentToBytes(priorEvents, appendEvent, layout);

            final String contentType = layout.getContentType();
            final String encoding = getEncoding(rawBytes, contentType);
            final byte[] encodedBytes = encodeContentToBytes(rawBytes, encoding);

            final InternetHeaders headers = getHeaders(contentType, encoding);
            final MimeMultipart mp = getMimeMultipart(encodedBytes, headers);

            final String subject = data.getSubjectSerializer().toSerializable(appendEvent);

            sendMultipartMessage(message, mp, subject);
        } catch (final MessagingException | IOException | RuntimeException e) {
            logError("Caught exception while sending e-mail notification.", e);
            throw new LoggingException("Error occurred while sending email", e);
        }
    }
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log4j-jakarta-smtp/src/main/java/org/apache/logging/log4j/smtp/SmtpManager.java [89:113]:
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    public void sendEvents(final Layout<?> layout, final LogEvent appendEvent) {
        if (message == null) {
            connect(appendEvent);
        }
        try {
            final LogEvent[] priorEvents = removeAllBufferedEvents();
            // LOG4J-310: log appendEvent even if priorEvents is empty

            final byte[] rawBytes = formatContentToBytes(priorEvents, appendEvent, layout);

            final String contentType = layout.getContentType();
            final String encoding = getEncoding(rawBytes, contentType);
            final byte[] encodedBytes = encodeContentToBytes(rawBytes, encoding);

            final InternetHeaders headers = getHeaders(contentType, encoding);
            final MimeMultipart mp = getMimeMultipart(encodedBytes, headers);

            final String subject = data.getSubjectSerializer().toSerializable(appendEvent);

            sendMultipartMessage(message, mp, subject);
        } catch (final MessagingException | IOException | RuntimeException e) {
            logError("Caught exception while sending e-mail notification.", e);
            throw new LoggingException("Error occurred while sending email", e);
        }
    }
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